139807998 has 48 divisors (see below), whose sum is σ = 341512080. Its totient is φ = 42364080.

The previous prime is 139807981. The next prime is 139807999. The reversal of 139807998 is 899708931.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139807999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4165 + ... + 17232.

It is an arithmetic number, because the mean of its divisors is an integer number (7114835).

Almost surely, 2^139807998 is an apocalyptic number.

139807998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139807998 is an abundant number, since it is smaller than the sum of its proper divisors (201704082).

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

139807998 is a wasteful number, since it uses less digits than its factorization.

139807998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21430 (or 21413 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 139807998 is about 11824.0432171064. The cubic root of 139807998 is about 519.0119279560.

The spelling of 139807998 in words is "one hundred thirty-nine million, eight hundred seven thousand, nine hundred ninety-eight".