420975157 has 4 divisors (see below), whose sum is σ = 421947820. Its totient is φ = 420002496.

The previous prime is 420975151. The next prime is 420975169. The reversal of 420975157 is 751579024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206381956 + 214593201 = 14366^2 + 14649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420975157 is a prime.

It is a super-2 number, since 2×420975157² = 354440165622349298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420975151) 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, 485682 + ... + 486547.

It is an arithmetic number, because the mean of its divisors is an integer number (105486955).

Almost surely, 2^420975157 is an apocalyptic number.

It is an amenable number.

420975157 is a deficient number, since it is larger than the sum of its proper divisors (972663).

420975157 is an equidigital number, since it uses as much as digits as its factorization.

420975157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972662.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 420975157 is about 20517.6791328844. The cubic root of 420975157 is about 749.4663801269.

The spelling of 420975157 in words is "four hundred twenty million, nine hundred seventy-five thousand, one hundred fifty-seven".