2123400456 has 48 divisors (see below), whose sum is σ = 5753180160. Its totient is φ = 707516640.

The previous prime is 2123400379. The next prime is 2123400469. The reversal of 2123400456 is 6540043212.

2123400456 is a `hidden beast` number, since 212 + 3 + 400 + 45 + 6 = 666.

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, 253861 + ... + 262091.

It is an arithmetic number, because the mean of its divisors is an integer number (119857920).

Almost surely, 2^2123400456 is an apocalyptic number.

It is an amenable number.

2123400456 is an abundant number, since it is smaller than the sum of its proper divisors (3629779704).

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

2123400456 is a wasteful number, since it uses less digits than its factorization.

2123400456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11826 (or 11819 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2123400456 is about 46080.3695297683. The cubic root of 2123400456 is about 1285.3181356876.

Adding to 2123400456 its reverse (6540043212), we get a palindrome (8663443668).

The spelling of 2123400456 in words is "two billion, one hundred twenty-three million, four hundred thousand, four hundred fifty-six".