2131923456 has 160 divisors (see below), whose sum is σ = 6796648320. Its totient is φ = 655921152.

The previous prime is 2131923433. The next prime is 2131923491. The reversal of 2131923456 is 6543291312.

2131923456 is a `hidden beast` number, since 2 + 13 + 192 + 3 + 456 = 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 2131923456.

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, 173781 + ... + 185643.

It is an arithmetic number, because the mean of its divisors is an integer number (42479052).

Almost surely, 2^2131923456 is an apocalyptic number.

2131923456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131923456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3398324160).

2131923456 is an abundant number, since it is smaller than the sum of its proper divisors (4664724864).

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

2131923456 is a wasteful number, since it uses less digits than its factorization.

2131923456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11903 (or 11881 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 2131923456 is about 46172.7566428516. The cubic root of 2131923456 is about 1287.0355291456.

The spelling of 2131923456 in words is "two billion, one hundred thirty-one million, nine hundred twenty-three thousand, four hundred fifty-six".