2156246406 has 72 divisors (see below), whose sum is σ = 4919948904. Its totient is φ = 708588000.

The previous prime is 2156246381. The next prime is 2156246413. The reversal of 2156246406 is 6046426512.

2156246406 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 2 + 4 + 640 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 956781 + ... + 959031.

Almost surely, 2^2156246406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156246406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459974452).

2156246406 is an abundant number, since it is smaller than the sum of its proper divisors (2763702498).

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

2156246406 is an frugal number, since it uses more digits than its factorization.

2156246406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 2156246406 is about 46435.4003536095. The cubic root of 2156246406 is about 1291.9115953115.

The spelling of 2156246406 in words is "two billion, one hundred fifty-six million, two hundred forty-six thousand, four hundred six".