139097790 has 128 divisors (see below), whose sum is σ = 417070080. Its totient is φ = 32731776.

The previous prime is 139097779. The next prime is 139097797. The reversal of 139097790 is 97790931.

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 (139097797) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79869 + ... + 81591.

It is an arithmetic number, because the mean of its divisors is an integer number (3258360).

Almost surely, 2^139097790 is an apocalyptic number.

139097790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139097790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208535040).

139097790 is an abundant number, since it is smaller than the sum of its proper divisors (277972290).

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

139097790 is a wasteful number, since it uses less digits than its factorization.

139097790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 139097790 is about 11793.9726131614. The cubic root of 139097790 is about 518.1315959888.

The spelling of 139097790 in words is "one hundred thirty-nine million, ninety-seven thousand, seven hundred ninety".