422791997 has 4 divisors (see below), whose sum is σ = 425592096. Its totient is φ = 419991900.

The previous prime is 422791979. The next prime is 422792011. The reversal of 422791997 is 799197224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 422791997 - 2²² = 418597693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422791697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399823 + ... + 1400124.

It is an arithmetic number, because the mean of its divisors is an integer number (106398024).

Almost surely, 2^422791997 is an apocalyptic number.

It is an amenable number.

422791997 is a deficient number, since it is larger than the sum of its proper divisors (2800099).

422791997 is a wasteful number, since it uses less digits than its factorization.

422791997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800098.

The product of its digits is 571536, while the sum is 50.

The square root of 422791997 is about 20561.9064534396. The cubic root of 422791997 is about 750.5430123848.

The spelling of 422791997 in words is "four hundred twenty-two million, seven hundred ninety-one thousand, nine hundred ninety-seven".