139497984 has 80 divisors (see below), whose sum is σ = 412964640. Its totient is φ = 46494720.

The previous prime is 139497973. The next prime is 139497989. The reversal of 139497984 is 489794931.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 139497984.

It is not an unprimeable number, because it can be changed into a prime (139497989) 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, 8779 + ... + 18869.

It is an arithmetic number, because the mean of its divisors is an integer number (5162058).

Almost surely, 2^139497984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139497984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206482320).

139497984 is an abundant number, since it is smaller than the sum of its proper divisors (273466656).

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

139497984 is an equidigital number, since it uses as much as digits as its factorization.

139497984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10118 (or 10096 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 139497984 is about 11810.9264666240. The cubic root of 139497984 is about 518.6280204029.

The spelling of 139497984 in words is "one hundred thirty-nine million, four hundred ninety-seven thousand, nine hundred eighty-four".