138140870 has 32 divisors (see below), whose sum is σ = 285942528. Its totient is φ = 47068128.

The previous prime is 138140857. The next prime is 138140879. The reversal of 138140870 is 78041831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138140879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5357 + ... + 17463.

It is an arithmetic number, because the mean of its divisors is an integer number (8935704).

Almost surely, 2^138140870 is an apocalyptic number.

138140870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138140870 is an abundant number, since it is smaller than the sum of its proper divisors (147801658).

138140870 is a wasteful number, since it uses less digits than its factorization.

138140870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12284.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 138140870 is about 11753.3344204953. The cubic root of 138140870 is about 516.9407028181.

The spelling of 138140870 in words is "one hundred thirty-eight million, one hundred forty thousand, eight hundred seventy".