120639998 has 4 divisors (see below), whose sum is σ = 180960000. Its totient is φ = 60319998.

The previous prime is 120639979. The next prime is 120640033. The reversal of 120639998 is 899936021.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30159998 + ... + 30160001.

It is an arithmetic number, because the mean of its divisors is an integer number (45240000).

Almost surely, 2^120639998 is an apocalyptic number.

120639998 is a deficient number, since it is larger than the sum of its proper divisors (60320002).

120639998 is an equidigital number, since it uses as much as digits as its factorization.

120639998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60320001.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 120639998 is about 10983.6240831522. The cubic root of 120639998 is about 494.1177332527.

The spelling of 120639998 in words is "one hundred twenty million, six hundred thirty-nine thousand, nine hundred ninety-eight".