139421952 has 144 divisors (see below), whose sum is σ = 430711680. Its totient is φ = 44402688.

The previous prime is 139421951. The next prime is 139421969. The reversal of 139421952 is 259124931.

139421952 is a `hidden beast` number, since 1 + 394 + 219 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (139421951) 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, 158538 + ... + 159414.

Almost surely, 2^139421952 is an apocalyptic number.

139421952 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 139421952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215355840).

139421952 is an abundant number, since it is smaller than the sum of its proper divisors (291289728).

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

139421952 is an equidigital number, since it uses as much as digits as its factorization.

139421952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 905 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 139421952 is about 11807.7073134457. The cubic root of 139421952 is about 518.5337789170.

The spelling of 139421952 in words is "one hundred thirty-nine million, four hundred twenty-one thousand, nine hundred fifty-two".