138617860 has 24 divisors (see below), whose sum is σ = 291392640. Its totient is φ = 55390944.

The previous prime is 138617839. The next prime is 138617861. The reversal of 138617860 is 68716831.

It is a super-2 number, since 2×138617860² = 38429822221959200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138617861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20821 + ... + 26659.

It is an arithmetic number, because the mean of its divisors is an integer number (12141360).

Almost surely, 2^138617860 is an apocalyptic number.

138617860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138617860 is an abundant number, since it is smaller than the sum of its proper divisors (152774780).

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

138617860 is a wasteful number, since it uses less digits than its factorization.

138617860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035 (or 7033 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 138617860 is about 11773.6086226781. The cubic root of 138617860 is about 517.5350050613.

The spelling of 138617860 in words is "one hundred thirty-eight million, six hundred seventeen thousand, eight hundred sixty".