138391650 has 36 divisors (see below), whose sum is σ = 371813442. Its totient is φ = 36904320.

The previous prime is 138391633. The next prime is 138391661. The reversal of 138391650 is 56193831.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 85988529 + 52403121 = 9273^2 + 7239^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 153319 + ... + 154218.

Almost surely, 2^138391650 is an apocalyptic number.

138391650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138391650 is an abundant number, since it is smaller than the sum of its proper divisors (233421792).

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

138391650 is a wasteful number, since it uses less digits than its factorization.

138391650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307555 (or 307547 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 138391650 is about 11763.9980448825. The cubic root of 138391650 is about 517.2533305974.

The spelling of 138391650 in words is "one hundred thirty-eight million, three hundred ninety-one thousand, six hundred fifty".