123420440 has 64 divisors (see below), whose sum is σ = 326259360. Its totient is φ = 41425920.

The previous prime is 123420439. The next prime is 123420469. The reversal of 123420440 is 44024321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5069 + ... + 16508.

Almost surely, 2^123420440 is an apocalyptic number.

123420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123420440 is an abundant number, since it is smaller than the sum of its proper divisors (202838920).

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

123420440 is a wasteful number, since it uses less digits than its factorization.

123420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21612 (or 21608 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 123420440 is about 11109.4752351315. The cubic root of 123420440 is about 497.8849860467.

Adding to 123420440 its reverse (44024321), we get a palindrome (167444761).

The spelling of 123420440 in words is "one hundred twenty-three million, four hundred twenty thousand, four hundred forty".