420939877 has 2 divisors, whose sum is σ = 420939878. Its totient is φ = 420939876.

The previous prime is 420939853. The next prime is 420939881. The reversal of 420939877 is 778939024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336869316 + 84070561 = 18354^2 + 9169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420939877 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420939877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420939377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210469938 + 210469939.

It is an arithmetic number, because the mean of its divisors is an integer number (210469939).

Almost surely, 2^420939877 is an apocalyptic number.

It is an amenable number.

420939877 is a deficient number, since it is larger than the sum of its proper divisors (1).

420939877 is an equidigital number, since it uses as much as digits as its factorization.

420939877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 420939877 is about 20516.8193685084. The cubic root of 420939877 is about 749.4454430936.

The spelling of 420939877 in words is "four hundred twenty million, nine hundred thirty-nine thousand, eight hundred seventy-seven".