420915779 has 4 divisors (see below), whose sum is σ = 420963840. Its totient is φ = 420867720.

The previous prime is 420915751. The next prime is 420915793. The reversal of 420915779 is 977519024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420915779 - 2²⁸ = 152480323 is a prime.

It is a super-2 number, since 2×420915779² = 354340186022353682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420915739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6752 + ... + 29789.

It is an arithmetic number, because the mean of its divisors is an integer number (105240960).

Almost surely, 2^420915779 is an apocalyptic number.

420915779 is a deficient number, since it is larger than the sum of its proper divisors (48061).

420915779 is a wasteful number, since it uses less digits than its factorization.

420915779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48060.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 420915779 is about 20516.2320858388. The cubic root of 420915779 is about 749.4311413830.

The spelling of 420915779 in words is "four hundred twenty million, nine hundred fifteen thousand, seven hundred seventy-nine".