120398981 has 8 divisors (see below), whose sum is σ = 131877720. Its totient is φ = 109408768.

The previous prime is 120398977. The next prime is 120398989. The reversal of 120398981 is 189893021.

It can be written as a sum of positive squares in 4 ways, for example, as 65772100 + 54626881 = 8110^2 + 7391^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 120398981 - 2² = 120398977 is a prime.

It is a super-2 number, since 2×120398981² = 28991829251676722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120398989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121616 + ... + 122601.

It is an arithmetic number, because the mean of its divisors is an integer number (16484715).

Almost surely, 2^120398981 is an apocalyptic number.

It is an amenable number.

120398981 is a deficient number, since it is larger than the sum of its proper divisors (11478739).

120398981 is a wasteful number, since it uses less digits than its factorization.

120398981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244263.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 120398981 is about 10972.6469459288. The cubic root of 120398981 is about 493.7884611176.

The spelling of 120398981 in words is "one hundred twenty million, three hundred ninety-eight thousand, nine hundred eighty-one".