423765990 has 24 divisors (see below), whose sum is σ = 1101791808. Its totient is φ = 113004240.

The previous prime is 423765971. The next prime is 423766043. The reversal of 423765990 is 99567324.

It is a happy number.

It is a super-2 number, since 2×423765990² = 359155228561360200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2354166 + ... + 2354345.

It is an arithmetic number, because the mean of its divisors is an integer number (45907992).

Almost surely, 2^423765990 is an apocalyptic number.

423765990 is an abundant number, since it is smaller than the sum of its proper divisors (678025818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423765990 is a wasteful number, since it uses less digits than its factorization.

423765990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708524 (or 4708521 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 423765990 is about 20585.5772326160. The cubic root of 423765990 is about 751.1189165376.

The spelling of 423765990 in words is "four hundred twenty-three million, seven hundred sixty-five thousand, nine hundred ninety".