421997079 has 16 divisors (see below), whose sum is σ = 663787520. Its totient is φ = 233362080.

The previous prime is 421997071. The next prime is 421997101. The reversal of 421997079 is 970799124.

It is a happy number.

It is not a de Polignac number, because 421997079 - 2³ = 421997071 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 (421997071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323464 + ... + 324765.

It is an arithmetic number, because the mean of its divisors is an integer number (41486720).

Almost surely, 2^421997079 is an apocalyptic number.

421997079 is a deficient number, since it is larger than the sum of its proper divisors (241790441).

421997079 is a wasteful number, since it uses less digits than its factorization.

421997079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648270.

The product of its (nonzero) digits is 285768, while the sum is 48.

The square root of 421997079 is about 20542.5674880235. The cubic root of 421997079 is about 750.0723361342.

The spelling of 421997079 in words is "four hundred twenty-one million, nine hundred ninety-seven thousand, seventy-nine".