123402420 has 48 divisors (see below), whose sum is σ = 383920320. Its totient is φ = 32907168.

The previous prime is 123402407. The next prime is 123402431. The reversal of 123402420 is 24204321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123402393 and 123402402.

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, 113722 + ... + 114801.

It is an arithmetic number, because the mean of its divisors is an integer number (7998340).

Almost surely, 2^123402420 is an apocalyptic number.

123402420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123402420 is an abundant number, since it is smaller than the sum of its proper divisors (260517900).

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

123402420 is a wasteful number, since it uses less digits than its factorization.

123402420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228541 (or 228533 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 123402420 is about 11108.6641861207. The cubic root of 123402420 is about 497.8607536367.

Adding to 123402420 its reverse (24204321), we get a palindrome (147606741).

The spelling of 123402420 in words is "one hundred twenty-three million, four hundred two thousand, four hundred twenty".