120991432 has 8 divisors (see below), whose sum is σ = 226858950. Its totient is φ = 60495712.

The previous prime is 120991391. The next prime is 120991447. The reversal of 120991432 is 234199021.

It can be written as a sum of positive squares in only one way, i.e., 85636516 + 35354916 = 9254^2 + 5946^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 120991394 and 120991403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561957 + ... + 7561972.

Almost surely, 2^120991432 is an apocalyptic number.

It is an amenable number.

120991432 is a deficient number, since it is larger than the sum of its proper divisors (105867518).

120991432 is a wasteful number, since it uses less digits than its factorization.

120991432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15123935 (or 15123931 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 120991432 is about 10999.6105385600. The cubic root of 120991432 is about 494.5970696479.

It can be divided in two parts, 12099 and 1432, that added together give a palindrome (13531).

The spelling of 120991432 in words is "one hundred twenty million, nine hundred ninety-one thousand, four hundred thirty-two".