420236557 has 4 divisors (see below), whose sum is σ = 452562460. Its totient is φ = 387910656.

The previous prime is 420236543. The next prime is 420236561. The reversal of 420236557 is 755632024.

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 59768361 + 360468196 = 7731^2 + 18986^2 .

It is a cyclic number.

It is not a de Polignac number, because 420236557 - 2¹⁵ = 420203789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420236567) 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, 16162932 + ... + 16162957.

It is an arithmetic number, because the mean of its divisors is an integer number (113140615).

Almost surely, 2^420236557 is an apocalyptic number.

It is an amenable number.

420236557 is a deficient number, since it is larger than the sum of its proper divisors (32325903).

420236557 is a wasteful number, since it uses less digits than its factorization.

420236557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32325902.

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 420236557 is about 20499.6721193291. The cubic root of 420236557 is about 749.0278111578.

The spelling of 420236557 in words is "four hundred twenty million, two hundred thirty-six thousand, five hundred fifty-seven".