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247404 = 22353389
BaseRepresentation
bin111100011001101100
3110120101010
4330121230
530404104
65145220
72050203
oct743154
9416333
10247404
11159973
12bb210
13887c1
146623a
154d489
hex3c66c

247404 has 24 divisors (see below), whose sum is σ = 589680. Its totient is φ = 80704.

The previous prime is 247393. The next prime is 247409. The reversal of 247404 is 404742.

It is a super-2 number, since 2×2474042 = 122417478432, which contains 22 as substring.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (247409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442 + ... + 830.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2247404 is an apocalyptic number.

It is an amenable number.

247404 is an abundant number, since it is smaller than the sum of its proper divisors (342276).

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

247404 is a wasteful number, since it uses less digits than its factorization.

247404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 247404 is about 497.3972255652. The cubic root of 247404 is about 62.7772430291. Note that the first 3 decimals are identical.

The spelling of 247404 in words is "two hundred forty-seven thousand, four hundred four", and thus it is an iban number.

Divisors: 1 2 3 4 6 12 53 106 159 212 318 389 636 778 1167 1556 2334 4668 20617 41234 61851 82468 123702 247404