2156439472 has 20 divisors (see below), whose sum is σ = 4557929256. Its totient is φ = 980199680.

The previous prime is 2156439427. The next prime is 2156439499. The reversal of 2156439472 is 2749346512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6126073 + ... + 6126424.

Almost surely, 2^2156439472 is an apocalyptic number.

2156439472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2156439472 is an abundant number, since it is smaller than the sum of its proper divisors (2401489784).

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

2156439472 is a wasteful number, since it uses less digits than its factorization.

2156439472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12252516 (or 12252510 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 2156439472 is about 46437.4791736158. The cubic root of 2156439472 is about 1291.9501525561.

The spelling of 2156439472 in words is "two billion, one hundred fifty-six million, four hundred thirty-nine thousand, four hundred seventy-two".