139497620 has 54 divisors (see below), whose sum is σ = 311414922. Its totient is φ = 52481952.

The previous prime is 139497587. The next prime is 139497637. The reversal of 139497620 is 26794931.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 27899524 = 10564^2 + 5282^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1003511 + ... + 1003649.

It is an arithmetic number, because the mean of its divisors is an integer number (5766943).

Almost surely, 2^139497620 is an apocalyptic number.

139497620 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 139497620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155707461).

139497620 is an abundant number, since it is smaller than the sum of its proper divisors (171917302).

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

139497620 is a wasteful number, since it uses less digits than its factorization.

139497620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 139497620 is about 11810.9110571539. The cubic root of 139497620 is about 518.6275693073.

The spelling of 139497620 in words is "one hundred thirty-nine million, four hundred ninety-seven thousand, six hundred twenty".