139021872 has 80 divisors (see below), whose sum is σ = 393724800. Its totient is φ = 41920000.

The previous prime is 139021871. The next prime is 139021873. The reversal of 139021872 is 278120931.

It is an interprime number because it is at equal distance from previous prime (139021871) and next prime (139021873).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (139021871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132004 + ... + 133052.

It is an arithmetic number, because the mean of its divisors is an integer number (4921560).

Almost surely, 2^139021872 is an apocalyptic number.

139021872 is a gapful number since it is divisible by the number (12) 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 139021872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196862400).

139021872 is an abundant number, since it is smaller than the sum of its proper divisors (254702928).

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

139021872 is a wasteful number, since it uses less digits than its factorization.

139021872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 139021872 is about 11790.7536654787. The cubic root of 139021872 is about 518.0373153800.

The spelling of 139021872 in words is "one hundred thirty-nine million, twenty-one thousand, eight hundred seventy-two".