16990040 has 32 divisors (see below), whose sum is σ = 38394000. Its totient is φ = 6766464.

The previous prime is 16990037. The next prime is 16990081. The reversal of 16990040 is 4009961.

It is a super-2 number, since 2×16990040² = 577322918403200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16989985 and 16990012.

It is a congruent number.

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, 9971 + ... + 11549.

Almost surely, 2^16990040 is an apocalyptic number.

16990040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16990040 is an abundant number, since it is smaller than the sum of its proper divisors (21403960).

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

16990040 is a wasteful number, since it uses less digits than its factorization.

16990040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 16990040 is about 4121.8976212419. The cubic root of 16990040 is about 257.0779336389.

It can be divided in two parts, 169 and 90040, that added together give a palindrome (90209).

The spelling of 16990040 in words is "sixteen million, nine hundred ninety thousand, forty".