139597740 has 72 divisors (see below), whose sum is σ = 428850240. Its totient is φ = 36751104.

The previous prime is 139597729. The next prime is 139597763. The reversal of 139597740 is 47795931.

139597740 is a `hidden beast` number, since 13 + 9 + 597 + 7 + 40 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9312 + ... + 19128.

Almost surely, 2^139597740 is an apocalyptic number.

139597740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139597740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214425120).

139597740 is an abundant number, since it is smaller than the sum of its proper divisors (289252500).

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

139597740 is a wasteful number, since it uses less digits than its factorization.

139597740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9911 (or 9906 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 139597740 is about 11815.1487506506. The cubic root of 139597740 is about 518.7516158076.

The spelling of 139597740 in words is "one hundred thirty-nine million, five hundred ninety-seven thousand, seven hundred forty".