138361954 has 4 divisors (see below), whose sum is σ = 207542934. Its totient is φ = 69180976.

The previous prime is 138361939. The next prime is 138361961. The reversal of 138361954 is 459163831.

138361954 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 459163831 = 7 ⋅65594833.

It can be written as a sum of positive squares in only one way, i.e., 131217025 + 7144929 = 11455^2 + 2673^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34590487 + ... + 34590490.

Almost surely, 2^138361954 is an apocalyptic number.

138361954 is a deficient number, since it is larger than the sum of its proper divisors (69180980).

138361954 is an equidigital number, since it uses as much as digits as its factorization.

138361954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69180979.

The product of its digits is 77760, while the sum is 40.

The square root of 138361954 is about 11762.7358212280. The cubic root of 138361954 is about 517.2163306442.

The spelling of 138361954 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, nine hundred fifty-four".