139521922 has 4 divisors (see below), whose sum is σ = 209282886. Its totient is φ = 69760960.

The previous prime is 139521919. The next prime is 139521923. The reversal of 139521922 is 229125931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 139499721 + 22201 = 11811^2 + 149^2 .

It is not an unprimeable number, because it can be changed into a prime (139521923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34880479 + ... + 34880482.

Almost surely, 2^139521922 is an apocalyptic number.

139521922 is a deficient number, since it is larger than the sum of its proper divisors (69760964).

139521922 is an equidigital number, since it uses as much as digits as its factorization.

139521922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69760963.

The product of its digits is 9720, while the sum is 34.

The square root of 139521922 is about 11811.9398068226. The cubic root of 139521922 is about 518.6576844098.

The spelling of 139521922 in words is "one hundred thirty-nine million, five hundred twenty-one thousand, nine hundred twenty-two".