420440978 has 16 divisors (see below), whose sum is σ = 647184384. Its totient is φ = 204731040.

The previous prime is 420440947. The next prime is 420440981. The reversal of 420440978 is 879044024.

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, 45551 + ... + 53997.

It is an arithmetic number, because the mean of its divisors is an integer number (40449024).

Almost surely, 2^420440978 is an apocalyptic number.

420440978 is a deficient number, since it is larger than the sum of its proper divisors (226743406).

420440978 is a wasteful number, since it uses less digits than its factorization.

420440978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9097.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 420440978 is about 20504.6574709260. The cubic root of 420440978 is about 749.1492445035.

The spelling of 420440978 in words is "four hundred twenty million, four hundred forty thousand, nine hundred seventy-eight".