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18990898 = 283233491
BaseRepresentation
bin100100001110…
…0011100110010
31022201211121121
41020130130302
514330202043
61515012454
7320264023
oct110343462
938654547
1018990898
11a7a1163
12643a12a
133c1c024
142744c4a
151a01ded
hex121c732

18990898 has 16 divisors (see below), whose sum is σ = 29012256. Its totient is φ = 9321760.

The previous prime is 18990883. The next prime is 18990901. The reversal of 18990898 is 89809981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38433 + ... + 38923.

It is an arithmetic number, because the mean of its divisors is an integer number (1813266).

Almost surely, 218990898 is an apocalyptic number.

18990898 is a deficient number, since it is larger than the sum of its proper divisors (10021358).

18990898 is a wasteful number, since it uses less digits than its factorization.

18990898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809.

The product of its (nonzero) digits is 373248, while the sum is 52.

The square root of 18990898 is about 4357.8547474646. The cubic root of 18990898 is about 266.7975479051.

The spelling of 18990898 in words is "eighteen million, nine hundred ninety thousand, eight hundred ninety-eight".

Divisors: 1 2 83 166 233 466 491 982 19339 38678 40753 81506 114403 228806 9495449 18990898