16400293 has 16 divisors (see below), whose sum is σ = 20298880. Its totient is φ = 12902976.

The previous prime is 16400273. The next prime is 16400299. The reversal of 16400293 is 39200461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16400293 is a prime.

It is a super-2 number, since 2×16400293² = 537939220971698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400299) 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, 20446 + ... + 21232.

It is an arithmetic number, because the mean of its divisors is an integer number (1268680).

Almost surely, 2^16400293 is an apocalyptic number.

16400293 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16400293 is a deficient number, since it is larger than the sum of its proper divisors (3898587).

16400293 is a wasteful number, since it uses less digits than its factorization.

16400293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16400293 is about 4049.7275216982. The cubic root of 16400293 is about 254.0683315857.

The spelling of 16400293 in words is "sixteen million, four hundred thousand, two hundred ninety-three".