120991406 has 16 divisors (see below), whose sum is σ = 188496720. Its totient is φ = 58196160.

The previous prime is 120991391. The next prime is 120991447. The reversal of 120991406 is 604199021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 15771.

It is an arithmetic number, because the mean of its divisors is an integer number (11781045).

Almost surely, 2^120991406 is an apocalyptic number.

120991406 is a deficient number, since it is larger than the sum of its proper divisors (67505314).

120991406 is a wasteful number, since it uses less digits than its factorization.

120991406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18499.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 120991406 is about 10999.6093566999. The cubic root of 120991406 is about 494.5970342197.

The spelling of 120991406 in words is "one hundred twenty million, nine hundred ninety-one thousand, four hundred six".