2170722394 has 4 divisors (see below), whose sum is σ = 3256083594. Its totient is φ = 1085361196.

The previous prime is 2170722383. The next prime is 2170722397. The reversal of 2170722394 is 4932270712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1460233369 + 710489025 = 38213^2 + 26655^2 .

It is not an unprimeable number, because it can be changed into a prime (2170722397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542680597 + ... + 542680600.

Almost surely, 2^2170722394 is an apocalyptic number.

2170722394 is a deficient number, since it is larger than the sum of its proper divisors (1085361200).

2170722394 is a wasteful number, since it uses less digits than its factorization.

2170722394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085361199.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 2170722394 is about 46591.0119443654. The cubic root of 2170722394 is about 1294.7962379228.

The spelling of 2170722394 in words is "two billion, one hundred seventy million, seven hundred twenty-two thousand, three hundred ninety-four".