16457381 has 4 divisors (see below), whose sum is σ = 16502592. Its totient is φ = 16412172.

The previous prime is 16457333. The next prime is 16457383. The reversal of 16457381 is 18375461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16457381 is a prime.

It is a super-2 number, since 2×16457381² = 541690778758322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16457383) 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, 22055 + ... + 22788.

It is an arithmetic number, because the mean of its divisors is an integer number (4125648).

Almost surely, 2^16457381 is an apocalyptic number.

It is an amenable number.

16457381 is a deficient number, since it is larger than the sum of its proper divisors (45211).

16457381 is an equidigital number, since it uses as much as digits as its factorization.

16457381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45210.

The product of its digits is 20160, while the sum is 35.

The square root of 16457381 is about 4056.7697740937. The cubic root of 16457381 is about 254.3627868135.

The spelling of 16457381 in words is "sixteen million, four hundred fifty-seven thousand, three hundred eighty-one".