16788381 has 16 divisors (see below), whose sum is σ = 23663040. Its totient is φ = 10558080.

The previous prime is 16788341. The next prime is 16788383. The reversal of 16788381 is 18388761.

It is not a de Polignac number, because 16788381 - 2⁷ = 16788253 is a prime.

It is a super-2 number, since 2×16788381² = 563699473202322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16788383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17371 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (1478940).

Almost surely, 2^16788381 is an apocalyptic number.

It is an amenable number.

16788381 is a deficient number, since it is larger than the sum of its proper divisors (6874659).

16788381 is a wasteful number, since it uses less digits than its factorization.

16788381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 64512, while the sum is 42.

The square root of 16788381 is about 4097.3626883643. The cubic root of 16788381 is about 256.0567755341.

The spelling of 16788381 in words is "sixteen million, seven hundred eighty-eight thousand, three hundred eighty-one".