18372416 has 28 divisors (see below), whose sum is σ = 36632388. Its totient is φ = 9142272.

The previous prime is 18372401. The next prime is 18372433. The reversal of 18372416 is 61427381.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 8386816 = 3160^2 + 2896^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15890 + ... + 17006.

Almost surely, 2^18372416 is an apocalyptic number.

18372416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18372416 is a deficient number, since it is larger than the sum of its proper divisors (18259972).

18372416 is a wasteful number, since it uses less digits than its factorization.

18372416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1376 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 18372416 is about 4286.3056353928. The cubic root of 18372416 is about 263.8692342903.

Adding to 18372416 its reverse (61427381), we get a palindrome (79799797).

The spelling of 18372416 in words is "eighteen million, three hundred seventy-two thousand, four hundred sixteen".