1890634661 has 8 divisors (see below), whose sum is σ = 1987239744. Its totient is φ = 1795229920.

The previous prime is 1890634657. The next prime is 1890634667. The reversal of 1890634661 is 1664360981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1890634661 - 2² = 1890634657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890634667) 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, 296855 + ... + 303156.

It is an arithmetic number, because the mean of its divisors is an integer number (248404968).

Almost surely, 2^1890634661 is an apocalyptic number.

It is an amenable number.

1890634661 is a deficient number, since it is larger than the sum of its proper divisors (96605083).

1890634661 is a wasteful number, since it uses less digits than its factorization.

1890634661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600171.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1890634661 is about 43481.4289208623. The cubic root of 1890634661 is about 1236.5239669971.

The spelling of 1890634661 in words is "one billion, eight hundred ninety million, six hundred thirty-four thousand, six hundred sixty-one".