7138408 has 24 divisors (see below), whose sum is σ = 13875030. Its totient is φ = 3442880.

The previous prime is 7138399. The next prime is 7138409. The reversal of 7138408 is 8048317.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6563844 + 574564 = 2562^2 + 758^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7138408.

It is not an unprimeable number, because it can be changed into a prime (7138409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6198 + ... + 7258.

Almost surely, 2^7138408 is an apocalyptic number.

It is an amenable number.

7138408 is a deficient number, since it is larger than the sum of its proper divisors (6736622).

7138408 is a wasteful number, since it uses less digits than its factorization.

7138408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 7138408 is about 2671.7799310572. The cubic root of 7138408 is about 192.5456843279.

Subtracting 7138408 from its reverse (8048317), we obtain a palindrome (909909).

The spelling of 7138408 in words is "seven million, one hundred thirty-eight thousand, four hundred eight".