18656416 has 12 divisors (see below), whose sum is σ = 36729882. Its totient is φ = 9328192.

The previous prime is 18656411. The next prime is 18656419. The reversal of 18656416 is 61465681.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 2624400 = 4004^2 + 1620^2 .

It is not an unprimeable number, because it can be changed into a prime (18656411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291475 + ... + 291538.

Almost surely, 2^18656416 is an apocalyptic number.

18656416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18656416 is a deficient number, since it is larger than the sum of its proper divisors (18073466).

18656416 is an equidigital number, since it uses as much as digits as its factorization.

18656416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583023 (or 583015 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 18656416 is about 4319.3073518795. The cubic root of 18656416 is about 265.2219145056.

It can be divided in two parts, 1865 and 6416, that added together give a square (8281 = 91²).

The spelling of 18656416 in words is "eighteen million, six hundred fifty-six thousand, four hundred sixteen".