421894079 has 2 divisors, whose sum is σ = 421894080. Its totient is φ = 421894078.

The previous prime is 421894061. The next prime is 421894093. The reversal of 421894079 is 970498124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421894079 is a prime.

It is a super-2 number, since 2×421894079² = 355989227790516482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421894009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210947039 + 210947040.

It is an arithmetic number, because the mean of its divisors is an integer number (210947040).

Almost surely, 2^421894079 is an apocalyptic number.

421894079 is a deficient number, since it is larger than the sum of its proper divisors (1).

421894079 is an equidigital number, since it uses as much as digits as its factorization.

421894079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 421894079 is about 20540.0603455783. The cubic root of 421894079 is about 750.0113059036.

The spelling of 421894079 in words is "four hundred twenty-one million, eight hundred ninety-four thousand, seventy-nine".