138378756 has 12 divisors (see below), whose sum is σ = 322883792. Its totient is φ = 46126248.

The previous prime is 138378743. The next prime is 138378769. The reversal of 138378756 is 657873831.

138378756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138378743) and next prime (138378769).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×138378756² = 38297360224215072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5765770 + ... + 5765793.

Almost surely, 2^138378756 is an apocalyptic number.

It is an amenable number.

138378756 is an abundant number, since it is smaller than the sum of its proper divisors (184505036).

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

138378756 is a wasteful number, since it uses less digits than its factorization.

138378756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11531570 (or 11531568 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The square root of 138378756 is about 11763.4500041442. The cubic root of 138378756 is about 517.2372658720.

The spelling of 138378756 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, seven hundred fifty-six".