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18424040 = 2353171453
BaseRepresentation
bin100011001001…
…0000011101000
31021200001000212
41012102003220
514204032130
61454520252
7312413255
oct106220350
937601025
1018424040
11a444288
126206088
133a80ccb
14263842c
15193de95
hex11920e8

18424040 has 32 divisors (see below), whose sum is σ = 41613480. Its totient is φ = 7341312.

The previous prime is 18424027. The next prime is 18424067. The reversal of 18424040 is 4042481.

It can be written as a sum of positive squares in 4 ways, for example, as 15319396 + 3104644 = 3914^2 + 1762^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18423997 and 18424015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11954 + ... + 13406.

Almost surely, 218424040 is an apocalyptic number.

18424040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18424040 is an abundant number, since it is smaller than the sum of its proper divisors (23189440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18424040 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (18424039) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1777).

18424040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18424040 is about 4292.3233801754. The cubic root of 18424040 is about 264.1161487696.

The spelling of 18424040 in words is "eighteen million, four hundred twenty-four thousand, forty".

Divisors: 1 2 4 5 8 10 20 40 317 634 1268 1453 1585 2536 2906 3170 5812 6340 7265 11624 12680 14530 29060 58120 460601 921202 1842404 2303005 3684808 4606010 9212020 18424040