2123440956 has 72 divisors (see below), whose sum is σ = 6606270944. Its totient is φ = 560027520.

The previous prime is 2123440951. The next prime is 2123440993. The reversal of 2123440956 is 6590443212.

It is a happy number.

2123440956 is a `hidden beast` number, since 2 + 123 + 440 + 95 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2123440956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123440951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320815 + ... + 327366.

Almost surely, 2^2123440956 is an apocalyptic number.

2123440956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2123440956 is an abundant number, since it is smaller than the sum of its proper divisors (4482829988).

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

2123440956 is a wasteful number, since it uses less digits than its factorization.

2123440956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648211 (or 648206 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2123440956 is about 46080.8089772738. The cubic root of 2123440956 is about 1285.3263073372.

The spelling of 2123440956 in words is "two billion, one hundred twenty-three million, four hundred forty thousand, nine hundred fifty-six".