422093978 has 4 divisors (see below), whose sum is σ = 633140970. Its totient is φ = 211046988.

The previous prime is 422093963. The next prime is 422093989. The reversal of 422093978 is 879390224.

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., 394141609 + 27952369 = 19853^2 + 5287^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105523493 + ... + 105523496.

Almost surely, 2^422093978 is an apocalyptic number.

422093978 is a deficient number, since it is larger than the sum of its proper divisors (211046992).

422093978 is a wasteful number, since it uses less digits than its factorization.

422093978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211046991.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 422093978 is about 20544.9258455707. The cubic root of 422093978 is about 750.1297422954.

The spelling of 422093978 in words is "four hundred twenty-two million, ninety-three thousand, nine hundred seventy-eight".