121770390 has 48 divisors (see below), whose sum is σ = 339967152. Its totient is φ = 27832896.

The previous prime is 121770377. The next prime is 121770401. The reversal of 121770390 is 93077121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 39949 + ... + 42888.

It is an arithmetic number, because the mean of its divisors is an integer number (7082649).

Almost surely, 2^121770390 is an apocalyptic number.

121770390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121770390 is an abundant number, since it is smaller than the sum of its proper divisors (218196762).

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

121770390 is a wasteful number, since it uses less digits than its factorization.

121770390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82861 (or 82854 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 121770390 is about 11034.9621657711. The cubic root of 121770390 is about 495.6562258658.

The spelling of 121770390 in words is "one hundred twenty-one million, seven hundred seventy thousand, three hundred ninety".