18831944 has 8 divisors (see below), whose sum is σ = 35309910. Its totient is φ = 9415968.

The previous prime is 18831931. The next prime is 18831947. The reversal of 18831944 is 44913881.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 5943844 = 3590^2 + 2438^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18831944² = 709284229638272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18831898 and 18831907.

It is not an unprimeable number, because it can be changed into a prime (18831947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1176989 + ... + 1177004.

Almost surely, 2^18831944 is an apocalyptic number.

It is an amenable number.

18831944 is a deficient number, since it is larger than the sum of its proper divisors (16477966).

18831944 is a wasteful number, since it uses less digits than its factorization.

18831944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353999 (or 2353995 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 18831944 is about 4339.5787814026. The cubic root of 18831944 is about 266.0510953912.

The spelling of 18831944 in words is "eighteen million, eight hundred thirty-one thousand, nine hundred forty-four".