123665420 has 24 divisors (see below), whose sum is σ = 265738704. Its totient is φ = 48315456.

The previous prime is 123665419. The next prime is 123665447. The reversal of 123665420 is 24566321.

It is a super-2 number, since 2×123665420² = 30586272207552800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71039 + ... + 72758.

It is an arithmetic number, because the mean of its divisors is an integer number (11072446).

Almost surely, 2^123665420 is an apocalyptic number.

123665420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123665420 is an abundant number, since it is smaller than the sum of its proper divisors (142073284).

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

123665420 is a wasteful number, since it uses less digits than its factorization.

123665420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143849 (or 143847 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 123665420 is about 11120.4954925579. The cubic root of 123665420 is about 498.2141893542.

Subtracting from 123665420 its reverse (24566321), we obtain a palindrome (99099099).

The spelling of 123665420 in words is "one hundred twenty-three million, six hundred sixty-five thousand, four hundred twenty".