2158008194 has 4 divisors (see below), whose sum is σ = 3237012294. Its totient is φ = 1079004096.

The previous prime is 2158008173. The next prime is 2158008199. The reversal of 2158008194 is 4918008512.

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., 2132130625 + 25877569 = 46175^2 + 5087^2 .

It is a super-2 number, since 2×2158008194² = 9313998730742283272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2158008199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539502047 + ... + 539502050.

Almost surely, 2^2158008194 is an apocalyptic number.

2158008194 is a deficient number, since it is larger than the sum of its proper divisors (1079004100).

2158008194 is a wasteful number, since it uses less digits than its factorization.

2158008194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079004099.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 2158008194 is about 46454.3667915084. The cubic root of 2158008194 is about 1292.2633570153.

The spelling of 2158008194 in words is "two billion, one hundred fifty-eight million, eight thousand, one hundred ninety-four".