1018189394 has 4 divisors (see below), whose sum is σ = 1527284094. Its totient is φ = 509094696.

The previous prime is 1018189387. The next prime is 1018189397. The reversal of 1018189394 is 4939818101.

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., 932386225 + 85803169 = 30535^2 + 9263^2 .

It is not an unprimeable number, because it can be changed into a prime (1018189397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254547347 + ... + 254547350.

Almost surely, 2^1018189394 is an apocalyptic number.

1018189394 is a deficient number, since it is larger than the sum of its proper divisors (509094700).

1018189394 is an equidigital number, since it uses as much as digits as its factorization.

1018189394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509094699.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1018189394 is about 31909.0801183613. The cubic root of 1018189394 is about 1006.0267368099.

The spelling of 1018189394 in words is "one billion, eighteen million, one hundred eighty-nine thousand, three hundred ninety-four".