121644978 has 32 divisors (see below), whose sum is σ = 299435136. Its totient is φ = 32082048.

The previous prime is 121644931. The next prime is 121645019. The reversal of 121644978 is 879446121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110851 + ... + 111942.

It is an arithmetic number, because the mean of its divisors is an integer number (9357348).

Almost surely, 2^121644978 is an apocalyptic number.

121644978 is an abundant number, since it is smaller than the sum of its proper divisors (177790158).

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

121644978 is a wasteful number, since it uses less digits than its factorization.

121644978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222818.

The product of its digits is 96768, while the sum is 42.

The square root of 121644978 is about 11029.2782175444. The cubic root of 121644978 is about 495.4860077176.

The spelling of 121644978 in words is "one hundred twenty-one million, six hundred forty-four thousand, nine hundred seventy-eight".