420715769 has 2 divisors, whose sum is σ = 420715770. Its totient is φ = 420715768.

The previous prime is 420715733. The next prime is 420715777. The reversal of 420715769 is 967517024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279391225 + 141324544 = 16715^2 + 11888^2 .

It is a cyclic number.

It is not a de Polignac number, because 420715769 - 2²⁸ = 152280313 is a prime.

It is a super-2 number, since 2×420715769² = 354003516570522722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420715469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210357884 + 210357885.

It is an arithmetic number, because the mean of its divisors is an integer number (210357885).

Almost surely, 2^420715769 is an apocalyptic number.

It is an amenable number.

420715769 is a deficient number, since it is larger than the sum of its proper divisors (1).

420715769 is an equidigital number, since it uses as much as digits as its factorization.

420715769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 420715769 is about 20511.3570735824. The cubic root of 420715769 is about 749.3124181305.

The spelling of 420715769 in words is "four hundred twenty million, seven hundred fifteen thousand, seven hundred sixty-nine".