420537457 has 4 divisors (see below), whose sum is σ = 428472180. Its totient is φ = 412602736.

The previous prime is 420537433. The next prime is 420537479. The reversal of 420537457 is 754735024.

It is a happy number.

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 334121841 + 86415616 = 18279^2 + 9296^2 .

It is a cyclic number.

It is not a de Polignac number, because 420537457 - 2⁷ = 420537329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420537407) 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, 3967282 + ... + 3967387.

It is an arithmetic number, because the mean of its divisors is an integer number (107118045).

Almost surely, 2^420537457 is an apocalyptic number.

It is an amenable number.

420537457 is a deficient number, since it is larger than the sum of its proper divisors (7934723).

420537457 is an equidigital number, since it uses as much as digits as its factorization.

420537457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7934722.

The product of its (nonzero) digits is 117600, while the sum is 37.

The square root of 420537457 is about 20507.0099478203. The cubic root of 420537457 is about 749.2065427895.

The spelling of 420537457 in words is "four hundred twenty million, five hundred thirty-seven thousand, four hundred fifty-seven".