1891217796 has 48 divisors (see below), whose sum is σ = 4759272000. Its totient is φ = 581058432.

The previous prime is 1891217791. The next prime is 1891217807. The reversal of 1891217796 is 6977121981.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1891217791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102055 + ... + 119153.

It is an arithmetic number, because the mean of its divisors is an integer number (99151500).

Almost surely, 2^1891217796 is an apocalyptic number.

It is an amenable number.

1891217796 is an abundant number, since it is smaller than the sum of its proper divisors (2868054204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1891217796 is a wasteful number, since it uses less digits than its factorization.

1891217796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17828 (or 17826 counting only the distinct ones).

The product of its digits is 381024, while the sum is 51.

The square root of 1891217796 is about 43488.1339677848. The cubic root of 1891217796 is about 1236.6510823864.

The spelling of 1891217796 in words is "one billion, eight hundred ninety-one million, two hundred seventeen thousand, seven hundred ninety-six".