139991580 has 36 divisors (see below), whose sum is σ = 424641672. Its totient is φ = 37331040.

The previous prime is 139991573. The next prime is 139991587. The reversal of 139991580 is 85199931.

It is an interprime number because it is at equal distance from previous prime (139991573) and next prime (139991587).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139991587) 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, 388686 + ... + 389045.

It is an arithmetic number, because the mean of its divisors is an integer number (11795602).

Almost surely, 2^139991580 is an apocalyptic number.

139991580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139991580 is an abundant number, since it is smaller than the sum of its proper divisors (284650092).

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

139991580 is a wasteful number, since it uses less digits than its factorization.

139991580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777746 (or 777741 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 139991580 is about 11831.8037509080. The cubic root of 139991580 is about 519.2390002620.

The spelling of 139991580 in words is "one hundred thirty-nine million, nine hundred ninety-one thousand, five hundred eighty".