139661402 has 8 divisors (see below), whose sum is σ = 212442912. Its totient is φ = 68847100.

The previous prime is 139661399. The next prime is 139661407. The reversal of 139661402 is 204166931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (139661407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491624 + ... + 491907.

It is an arithmetic number, because the mean of its divisors is an integer number (26555364).

Almost surely, 2^139661402 is an apocalyptic number.

139661402 is a deficient number, since it is larger than the sum of its proper divisors (72781510).

139661402 is an equidigital number, since it uses as much as digits as its factorization.

139661402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983604.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 139661402 is about 11817.8425272974. The cubic root of 139661402 is about 518.8304607957.

The spelling of 139661402 in words is "one hundred thirty-nine million, six hundred sixty-one thousand, four hundred two".