122405978 has 4 divisors (see below), whose sum is σ = 183608970. Its totient is φ = 61202988.

The previous prime is 122405971. The next prime is 122406043. The reversal of 122405978 is 879504221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 122168809 + 237169 = 11053^2 + 487^2 .

It is not an unprimeable number, because it can be changed into a prime (122405971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30601493 + ... + 30601496.

Almost surely, 2^122405978 is an apocalyptic number.

122405978 is a deficient number, since it is larger than the sum of its proper divisors (61202992).

122405978 is an equidigital number, since it uses as much as digits as its factorization.

122405978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61202991.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 122405978 is about 11063.7235142605. The cubic root of 122405978 is about 496.5170991360.

The spelling of 122405978 in words is "one hundred twenty-two million, four hundred five thousand, nine hundred seventy-eight".