121978418 has 16 divisors (see below), whose sum is σ = 188289240. Its totient is φ = 59222016.

The previous prime is 121978399. The next prime is 121978421. The reversal of 121978418 is 814879121.

It can be written as a sum of positive squares in 4 ways, for example, as 55995289 + 65983129 = 7483^2 + 8123^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44018 + ... + 46706.

Almost surely, 2^121978418 is an apocalyptic number.

121978418 is a deficient number, since it is larger than the sum of its proper divisors (66310822).

121978418 is a wasteful number, since it uses less digits than its factorization.

121978418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its digits is 32256, while the sum is 41.

The square root of 121978418 is about 11044.3840027409. The cubic root of 121978418 is about 495.9383188343.

The spelling of 121978418 in words is "one hundred twenty-one million, nine hundred seventy-eight thousand, four hundred eighteen".