120405890 has 48 divisors (see below), whose sum is σ = 240166080. Its totient is φ = 43428000.

The previous prime is 120405853. The next prime is 120405893. The reversal of 120405890 is 98504021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120405893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182381 + ... + 183039.

It is an arithmetic number, because the mean of its divisors is an integer number (5003460).

Almost surely, 2^120405890 is an apocalyptic number.

120405890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

120405890 is a deficient number, since it is larger than the sum of its proper divisors (119760190).

120405890 is a wasteful number, since it uses less digits than its factorization.

120405890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 120405890 is about 10972.9617697320. The cubic root of 120405890 is about 493.7979061566.

The spelling of 120405890 in words is "one hundred twenty million, four hundred five thousand, eight hundred ninety".