123478420 has 24 divisors (see below), whose sum is σ = 279251784. Its totient is φ = 45591936.

The previous prime is 123478391. The next prime is 123478423. The reversal of 123478420 is 24874321.

It can be written as a sum of positive squares in 4 ways, for example, as 28259856 + 95218564 = 5316^2 + 9758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123478423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237199 + ... + 237718.

It is an arithmetic number, because the mean of its divisors is an integer number (11635491).

Almost surely, 2^123478420 is an apocalyptic number.

123478420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123478420 is an abundant number, since it is smaller than the sum of its proper divisors (155773364).

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

123478420 is a wasteful number, since it uses less digits than its factorization.

123478420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474939 (or 474937 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 123478420 is about 11112.0844129263. The cubic root of 123478420 is about 497.9629386999.

The spelling of 123478420 in words is "one hundred twenty-three million, four hundred seventy-eight thousand, four hundred twenty".