121644340 has 12 divisors (see below), whose sum is σ = 255453156. Its totient is φ = 48657728.

The previous prime is 121644337. The next prime is 121644361. The reversal of 121644340 is 43446121.

It can be written as a sum of positive squares in 2 ways, for example, as 42042256 + 79602084 = 6484^2 + 8922^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3041089 + ... + 3041128.

It is an arithmetic number, because the mean of its divisors is an integer number (21287763).

Almost surely, 2^121644340 is an apocalyptic number.

121644340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121644340 is an abundant number, since it is smaller than the sum of its proper divisors (133808816).

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

121644340 is a wasteful number, since it uses less digits than its factorization.

121644340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6082226 (or 6082224 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 121644340 is about 11029.2492944896. The cubic root of 121644340 is about 495.4851414793.

The spelling of 121644340 in words is "one hundred twenty-one million, six hundred forty-four thousand, three hundred forty".