139749888 has 80 divisors (see below), whose sum is σ = 382520160. Its totient is φ = 45305856.

The previous prime is 139749833. The next prime is 139749899. The reversal of 139749888 is 888947931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55603 + ... + 58061.

It is an arithmetic number, because the mean of its divisors is an integer number (4781502).

Almost surely, 2^139749888 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 139749888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191260080).

139749888 is an abundant number, since it is smaller than the sum of its proper divisors (242770272).

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

139749888 is an equidigital number, since it uses as much as digits as its factorization.

139749888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517 (or 2501 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 57.

The square root of 139749888 is about 11821.5856804407. The cubic root of 139749888 is about 518.9400103665.

The spelling of 139749888 in words is "one hundred thirty-nine million, seven hundred forty-nine thousand, eight hundred eighty-eight".