16939240 has 16 divisors (see below), whose sum is σ = 38113380. Its totient is φ = 6775680.

The previous prime is 16939231. The next prime is 16939243. The reversal of 16939240 is 4293961.

It can be written as a sum of positive squares in 2 ways, for example, as 14243076 + 2696164 = 3774^2 + 1642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16939196 and 16939205.

It is not an unprimeable number, because it can be changed into a prime (16939243) 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, 211701 + ... + 211780.

Almost surely, 2^16939240 is an apocalyptic number.

16939240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16939240 is an abundant number, since it is smaller than the sum of its proper divisors (21174140).

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

16939240 is a wasteful number, since it uses less digits than its factorization.

16939240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423492 (or 423488 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 16939240 is about 4115.7307978049. The cubic root of 16939240 is about 256.8214579495.

The spelling of 16939240 in words is "sixteen million, nine hundred thirty-nine thousand, two hundred forty".