16898431 has 4 divisors (see below), whose sum is σ = 18434664. Its totient is φ = 15362200.

The previous prime is 16898423. The next prime is 16898447. The reversal of 16898431 is 13489861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16898431 - 2³ = 16898423 is a prime.

It is a super-2 number, since 2×16898431² = 571113940523522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16890431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768100 + ... + 768121.

It is an arithmetic number, because the mean of its divisors is an integer number (4608666).

Almost surely, 2^16898431 is an apocalyptic number.

16898431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16898431 is a deficient number, since it is larger than the sum of its proper divisors (1536233).

16898431 is a wasteful number, since it uses less digits than its factorization.

16898431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536232.

The product of its digits is 41472, while the sum is 40.

The square root of 16898431 is about 4110.7701224953. The cubic root of 16898431 is about 256.6150524950.

Subtracting from 16898431 its sum of digits (40), we obtain a triangular number (16898391 = T₅₈₁₃).

The spelling of 16898431 in words is "sixteen million, eight hundred ninety-eight thousand, four hundred thirty-one".