18881396 has 24 divisors (see below), whose sum is σ = 34266120. Its totient is φ = 9096192.

The previous prime is 18881389. The next prime is 18881411. The reversal of 18881396 is 69318881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 18835600 = 214^2 + 4340^2 .

It is a super-2 number, since 2×18881396² = 713014229817632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16160 + ... + 17288.

It is an arithmetic number, because the mean of its divisors is an integer number (1427755).

Almost surely, 2^18881396 is an apocalyptic number.

It is an amenable number.

18881396 is a deficient number, since it is larger than the sum of its proper divisors (15384724).

18881396 is a wasteful number, since it uses less digits than its factorization.

18881396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1281 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 18881396 is about 4345.2728337816. The cubic root of 18881396 is about 266.2837720097.

The spelling of 18881396 in words is "eighteen million, eight hundred eighty-one thousand, three hundred ninety-six".