2157289826 has 8 divisors (see below), whose sum is σ = 3236170320. Its totient is φ = 1078566388.

The previous prime is 2157289789. The next prime is 2157289859. The reversal of 2157289826 is 6289827512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2157289826² = 9307798786726220552, which contains 22 as substring.

It is a Curzon number.

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, 5105 + ... + 65883.

It is an arithmetic number, because the mean of its divisors is an integer number (404521290).

Almost surely, 2^2157289826 is an apocalyptic number.

2157289826 is a deficient number, since it is larger than the sum of its proper divisors (1078880494).

2157289826 is a wasteful number, since it uses less digits than its factorization.

2157289826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78528.

The product of its digits is 967680, while the sum is 50.

The square root of 2157289826 is about 46446.6341729947. The cubic root of 2157289826 is about 1292.1199495168.

The spelling of 2157289826 in words is "two billion, one hundred fifty-seven million, two hundred eighty-nine thousand, eight hundred twenty-six".