121980990 has 16 divisors (see below), whose sum is σ = 292754448. Its totient is φ = 32528256.

The previous prime is 121980973. The next prime is 121981019. The reversal of 121980990 is 99089121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2032987 + ... + 2033046.

It is an arithmetic number, because the mean of its divisors is an integer number (18297153).

Almost surely, 2^121980990 is an apocalyptic number.

121980990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121980990 is an abundant number, since it is smaller than the sum of its proper divisors (170773458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121980990 is a wasteful number, since it uses less digits than its factorization.

121980990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066043.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 121980990 is about 11044.5004413962. The cubic root of 121980990 is about 495.9418045449.

The spelling of 121980990 in words is "one hundred twenty-one million, nine hundred eighty thousand, nine hundred ninety".