16691940 has 48 divisors (see below), whose sum is σ = 51932160. Its totient is φ = 4451040.

The previous prime is 16691923. The next prime is 16691957. The reversal of 16691940 is 4919661.

It is an interprime number because it is at equal distance from previous prime (16691923) and next prime (16691957).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16691895 and 16691904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14916 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (1081920).

Almost surely, 2^16691940 is an apocalyptic number.

16691940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16691940 is an abundant number, since it is smaller than the sum of its proper divisors (35240220).

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

16691940 is a wasteful number, since it uses less digits than its factorization.

16691940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30929 (or 30921 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 16691940 is about 4085.5770706229. The cubic root of 16691940 is about 255.5655268811.

The spelling of 16691940 in words is "sixteen million, six hundred ninety-one thousand, nine hundred forty".