1945189394 has 16 divisors (see below), whose sum is σ = 2942286336. Its totient is φ = 964438800.

The previous prime is 1945189381. The next prime is 1945189439. The reversal of 1945189394 is 4939815491.

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, 551324 + ... + 554840.

It is an arithmetic number, because the mean of its divisors is an integer number (183892896).

Almost surely, 2^1945189394 is an apocalyptic number.

1945189394 is a deficient number, since it is larger than the sum of its proper divisors (997096942).

1945189394 is a wasteful number, since it uses less digits than its factorization.

1945189394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761.

The product of its digits is 1399680, while the sum is 53.

The square root of 1945189394 is about 44104.3013095095. The cubic root of 1945189394 is about 1248.3047727229.

The spelling of 1945189394 in words is "one billion, nine hundred forty-five million, one hundred eighty-nine thousand, three hundred ninety-four".