139221432 has 96 divisors (see below), whose sum is σ = 456300000. Its totient is φ = 37435392.

The previous prime is 139221421. The next prime is 139221437. The reversal of 139221432 is 234122931.

It is a happy number.

139221432 is a `hidden beast` number, since 1 + 3 + 9 + 221 + 432 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 139221396 and 139221405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139221437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444 + ... + 16692.

It is an arithmetic number, because the mean of its divisors is an integer number (4753125).

Almost surely, 2^139221432 is an apocalyptic number.

139221432 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 139221432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228150000).

139221432 is an abundant number, since it is smaller than the sum of its proper divisors (317078568).

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

139221432 is a wasteful number, since it uses less digits than its factorization.

139221432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16285 (or 16278 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 139221432 is about 11799.2131941075. The cubic root of 139221432 is about 518.2850704010.

The spelling of 139221432 in words is "one hundred thirty-nine million, two hundred twenty-one thousand, four hundred thirty-two".