1891956396 has 24 divisors (see below), whose sum is σ = 4815889344. Its totient is φ = 573320080.

The previous prime is 1891956389. The next prime is 1891956397. The reversal of 1891956396 is 6936591981.

It is not an unprimeable number, because it can be changed into a prime (1891956397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7166370 + ... + 7166633.

It is an arithmetic number, because the mean of its divisors is an integer number (200662056).

Almost surely, 2^1891956396 is an apocalyptic number.

It is an amenable number.

1891956396 is an abundant number, since it is smaller than the sum of its proper divisors (2923932948).

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

1891956396 is a wasteful number, since it uses less digits than its factorization.

1891956396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14333021 (or 14333019 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 57.

The square root of 1891956396 is about 43496.6251104612. The cubic root of 1891956396 is about 1236.8120495000.

It can be divided in two parts, 189195 and 6396, that added together give a palindrome (195591).

The spelling of 1891956396 in words is "one billion, eight hundred ninety-one million, nine hundred fifty-six thousand, three hundred ninety-six".