2157426947 has 8 divisors (see below), whose sum is σ = 2372817216. Its totient is φ = 1949098752.

The previous prime is 2157426941. The next prime is 2157426959. The reversal of 2157426947 is 7496247512.

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

It is a cyclic number.

It is not a de Polignac number, because 2157426947 - 2¹⁸ = 2157164803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157426941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1764878 + ... + 1766099.

It is an arithmetic number, because the mean of its divisors is an integer number (296602152).

Almost surely, 2^2157426947 is an apocalyptic number.

2157426947 is a deficient number, since it is larger than the sum of its proper divisors (215390269).

2157426947 is a wasteful number, since it uses less digits than its factorization.

2157426947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531037.

The product of its digits is 846720, while the sum is 47.

The square root of 2157426947 is about 46448.1102629590. The cubic root of 2157426947 is about 1292.1473253819.

The spelling of 2157426947 in words is "two billion, one hundred fifty-seven million, four hundred twenty-six thousand, nine hundred forty-seven".