423800557 has 2 divisors, whose sum is σ = 423800558. Its totient is φ = 423800556.

The previous prime is 423800543. The next prime is 423800563. The reversal of 423800557 is 755008324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423783396 + 17161 = 20586^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 423800557 - 2²⁷ = 289582829 is a prime.

It is a super-2 number, since 2×423800557² = 359213824227020498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423800537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211900278 + 211900279.

It is an arithmetic number, because the mean of its divisors is an integer number (211900279).

Almost surely, 2^423800557 is an apocalyptic number.

It is an amenable number.

423800557 is a deficient number, since it is larger than the sum of its proper divisors (1).

423800557 is an equidigital number, since it uses as much as digits as its factorization.

423800557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 423800557 is about 20586.4168081772. The cubic root of 423800557 is about 751.1393391468.

The spelling of 423800557 in words is "four hundred twenty-three million, eight hundred thousand, five hundred fifty-seven".