1890641992 has 16 divisors (see below), whose sum is σ = 3555174960. Its totient is φ = 942595344.

The previous prime is 1890641989. The next prime is 1890641993. The reversal of 1890641992 is 2991460981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1890641993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337758 + ... + 343309.

It is an arithmetic number, because the mean of its divisors is an integer number (222198435).

Almost surely, 2^1890641992 is an apocalyptic number.

It is an amenable number.

1890641992 is a deficient number, since it is larger than the sum of its proper divisors (1664532968).

1890641992 is a wasteful number, since it uses less digits than its factorization.

1890641992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681420 (or 681416 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 1890641992 is about 43481.5132211380. The cubic root of 1890641992 is about 1236.5255652162.

The spelling of 1890641992 in words is "one billion, eight hundred ninety million, six hundred forty-one thousand, nine hundred ninety-two".