120815890 has 32 divisors (see below), whose sum is σ = 234763200. Its totient is φ = 44501184.

The previous prime is 120815887. The next prime is 120815917. The reversal of 120815890 is 98518021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70261 + ... + 71959.

It is an arithmetic number, because the mean of its divisors is an integer number (7336350).

Almost surely, 2^120815890 is an apocalyptic number.

120815890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

120815890 is a deficient number, since it is larger than the sum of its proper divisors (113947310).

120815890 is a wasteful number, since it uses less digits than its factorization.

120815890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 120815890 is about 10991.6281778452. The cubic root of 120815890 is about 494.3577563333.

It can be divided in two parts, 12081 and 5890, that added together give a palindrome (17971).

The spelling of 120815890 in words is "one hundred twenty million, eight hundred fifteen thousand, eight hundred ninety".