420688823 has 24 divisors (see below), whose sum is σ = 466106256. Its totient is φ = 379209600.

The previous prime is 420688813. The next prime is 420688859. The reversal of 420688823 is 328886024.

It is not a de Polignac number, because 420688823 - 2⁶ = 420688759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420688813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 636113 + ... + 636773.

It is an arithmetic number, because the mean of its divisors is an integer number (19421094).

Almost surely, 2^420688823 is an apocalyptic number.

420688823 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

420688823 is a deficient number, since it is larger than the sum of its proper divisors (45417433).

420688823 is a wasteful number, since it uses less digits than its factorization.

420688823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 420688823 is about 20510.7002074527. The cubic root of 420688823 is about 749.2964204705.

The spelling of 420688823 in words is "four hundred twenty million, six hundred eighty-eight thousand, eight hundred twenty-three".