16940781 has 24 divisors (see below), whose sum is σ = 28750176. Its totient is φ = 9476640.

The previous prime is 16940773. The next prime is 16940827. The reversal of 16940781 is 18704961.

It is not a de Polignac number, because 16940781 - 2³ = 16940773 is a prime.

It is a super-2 number, since 2×16940781² = 573980121779922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16940701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5295 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (1197924).

Almost surely, 2^16940781 is an apocalyptic number.

16940781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16940781 is a deficient number, since it is larger than the sum of its proper divisors (11809395).

16940781 is a wasteful number, since it uses less digits than its factorization.

16940781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13193 (or 13190 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 16940781 is about 4115.9180020987. The cubic root of 16940781 is about 256.8292455847.

The spelling of 16940781 in words is "sixteen million, nine hundred forty thousand, seven hundred eighty-one".