2157769394 has 16 divisors (see below), whose sum is σ = 3531862656. Its totient is φ = 980535600.

The previous prime is 2157769379. The next prime is 2157769451. The reversal of 2157769394 is 4939677512.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84599 + ... + 107109.

It is an arithmetic number, because the mean of its divisors is an integer number (220741416).

Almost surely, 2^2157769394 is an apocalyptic number.

2157769394 is a deficient number, since it is larger than the sum of its proper divisors (1374093262).

2157769394 is a wasteful number, since it uses less digits than its factorization.

2157769394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26881.

The product of its digits is 2857680, while the sum is 53.

The square root of 2157769394 is about 46451.7964561114. The cubic root of 2157769394 is about 1292.2156890046.

The spelling of 2157769394 in words is "two billion, one hundred fifty-seven million, seven hundred sixty-nine thousand, three hundred ninety-four".