7138908 has 144 divisors (see below), whose sum is σ = 22982400. Its totient is φ = 1905120.

The previous prime is 7138883. The next prime is 7138919. The reversal of 7138908 is 8098317.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100513 + ... + 100583.

It is an arithmetic number, because the mean of its divisors is an integer number (159600).

Almost surely, 2^7138908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7138908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11491200).

7138908 is an abundant number, since it is smaller than the sum of its proper divisors (15843492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7138908 is a wasteful number, since it uses less digits than its factorization.

7138908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 7138908 is about 2671.8734999996. The cubic root of 7138908 is about 192.5501797558.

The spelling of 7138908 in words is "seven million, one hundred thirty-eight thousand, nine hundred eight".