139199990 has 16 divisors (see below), whose sum is σ = 250950960. Its totient is φ = 55593120.

The previous prime is 139199989. The next prime is 139199993. The reversal of 139199990 is 99991931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139199993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3920 + ... + 17139.

It is an arithmetic number, because the mean of its divisors is an integer number (15684435).

Almost surely, 2^139199990 is an apocalyptic number.

139199990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139199990 is a deficient number, since it is larger than the sum of its proper divisors (111750970).

139199990 is a wasteful number, since it uses less digits than its factorization.

139199990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21727.

The product of its (nonzero) digits is 177147, while the sum is 50.

The square root of 139199990 is about 11798.3045392124. The cubic root of 139199990 is about 518.2584613775.

The spelling of 139199990 in words is "one hundred thirty-nine million, one hundred ninety-nine thousand, nine hundred ninety".