16840431 has 12 divisors (see below), whose sum is σ = 24434280. Its totient is φ = 11176560.

The previous prime is 16840399. The next prime is 16840433. The reversal of 16840431 is 13404861.

16840431 = 149² + 150² + ... + 377².

It is not a de Polignac number, because 16840431 - 2⁵ = 16840399 is a prime.

It is a super-2 number, since 2×16840431² = 567200232531522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16840395 and 16840404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16840433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2025 + ... + 6146.

It is an arithmetic number, because the mean of its divisors is an integer number (2036190).

Almost surely, 2^16840431 is an apocalyptic number.

16840431 is a deficient number, since it is larger than the sum of its proper divisors (7593849).

16840431 is a wasteful number, since it uses less digits than its factorization.

16840431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406 (or 8403 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 16840431 is about 4103.7094195374. The cubic root of 16840431 is about 256.3211251307.

It can be divided in two parts, 16840 and 431, that added together give a palindrome (17271).

The spelling of 16840431 in words is "sixteen million, eight hundred forty thousand, four hundred thirty-one".