8131408 has 10 divisors (see below), whose sum is σ = 15754634. Its totient is φ = 4065696.

The previous prime is 8131399. The next prime is 8131421. The reversal of 8131408 is 8041318.

It can be written as a sum of positive squares in only one way, i.e., 7033104 + 1098304 = 2652^2 + 1048^2 .

It is a super-2 number, since 2×8131408² = 132239592124928, 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 as a sum of consecutive naturals, namely, 254091 + ... + 254122.

Almost surely, 2^8131408 is an apocalyptic number.

It is an amenable number.

8131408 is a deficient number, since it is larger than the sum of its proper divisors (7623226).

8131408 is a wasteful number, since it uses less digits than its factorization.

8131408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508221 (or 508215 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 8131408 is about 2851.5623787671. The cubic root of 8131408 is about 201.0891249351.

The spelling of 8131408 in words is "eight million, one hundred thirty-one thousand, four hundred eight".