1891961894 has 8 divisors (see below), whose sum is σ = 2838680208. Its totient is φ = 945735160.

The previous prime is 1891961887. The next prime is 1891961927. The reversal of 1891961894 is 4981691981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113117 + ... + 128760.

It is an arithmetic number, because the mean of its divisors is an integer number (354835026).

Almost surely, 2^1891961894 is an apocalyptic number.

1891961894 is a deficient number, since it is larger than the sum of its proper divisors (946718314).

1891961894 is a wasteful number, since it uses less digits than its factorization.

1891961894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245790.

The product of its digits is 1119744, while the sum is 56.

The square root of 1891961894 is about 43496.6883107209. The cubic root of 1891961894 is about 1236.8132475519.

The spelling of 1891961894 in words is "one billion, eight hundred ninety-one million, nine hundred sixty-one thousand, eight hundred ninety-four".