2157926782 has 16 divisors (see below), whose sum is σ = 3531960432. Its totient is φ = 980651520.

The previous prime is 2157926759. The next prime is 2157926783. The reversal of 2157926782 is 2876297512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157926783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122728 + ... + 139204.

It is an arithmetic number, because the mean of its divisors is an integer number (220747527).

Almost surely, 2^2157926782 is an apocalyptic number.

2157926782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2157926782 is a deficient number, since it is larger than the sum of its proper divisors (1374033650).

2157926782 is a wasteful number, since it uses less digits than its factorization.

2157926782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22443.

The product of its digits is 846720, while the sum is 49.

The square root of 2157926782 is about 46453.4905254707. The cubic root of 2157926782 is about 1292.2471063715.

The spelling of 2157926782 in words is "two billion, one hundred fifty-seven million, nine hundred twenty-six thousand, seven hundred eighty-two".