138257650 has 24 divisors (see below), whose sum is σ = 261523440. Its totient is φ = 54364560.

The previous prime is 138257629. The next prime is 138257653. The reversal of 138257650 is 56752831.

138257650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138257653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20484 + ... + 26383.

It is an arithmetic number, because the mean of its divisors is an integer number (10896810).

Almost surely, 2^138257650 is an apocalyptic number.

138257650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138257650 is a deficient number, since it is larger than the sum of its proper divisors (123265790).

138257650 is a wasteful number, since it uses less digits than its factorization.

138257650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46938 (or 46933 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 138257650 is about 11758.3013228952. The cubic root of 138257650 is about 517.0863303264.

The spelling of 138257650 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, six hundred fifty".