139321990 has 8 divisors (see below), whose sum is σ = 250779600. Its totient is φ = 55728792.

The previous prime is 139321961. The next prime is 139322077. The reversal of 139321990 is 99123931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6966090 + ... + 6966109.

It is an arithmetic number, because the mean of its divisors is an integer number (31347450).

Almost surely, 2^139321990 is an apocalyptic number.

139321990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139321990 is a deficient number, since it is larger than the sum of its proper divisors (111457610).

139321990 is a wasteful number, since it uses less digits than its factorization.

139321990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13932206.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 139321990 is about 11803.4736412634. The cubic root of 139321990 is about 518.4098241030.

The spelling of 139321990 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, nine hundred ninety".