139972 has 12 divisors (see below), whose sum is σ = 280000. Its totient is φ = 59976.

The previous prime is 139969. The next prime is 139981. The reversal of 139972 is 279931.

139972 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2472 + ... + 2527.

139972 is a Friedman number, since it can be written as (9+(9-3)^7-1)/2, using all its digits and the basic arithmetic operations.

2¹³⁹⁹⁷² is an apocalyptic number.

It is an amenable number.

139972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

139972 is a wasteful number, since it uses less digits than its factorization.

139972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010 (or 5008 counting only the distinct ones).

The product of its digits is 3402, while the sum is 31.

The square root of 139972 is about 374.1283202325. The cubic root of 139972 is about 51.9214791250.

It can be divided in two parts, 139 and 972, that added together give a palindrome (1111).

The spelling of 139972 in words is "one hundred thirty-nine thousand, nine hundred seventy-two".