1990868495 has 16 divisors (see below), whose sum is σ = 2978546688. Its totient is φ = 1241060640.

The previous prime is 1990868491. The next prime is 1990868543. The reversal of 1990868495 is 5948680991.

It is not a de Polignac number, because 1990868495 - 2² = 1990868491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990868491) 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, 2585159 + ... + 2585928.

It is an arithmetic number, because the mean of its divisors is an integer number (186159168).

Almost surely, 2^1990868495 is an apocalyptic number.

1990868495 is a deficient number, since it is larger than the sum of its proper divisors (987678193).

1990868495 is a wasteful number, since it uses less digits than its factorization.

1990868495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171110.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The square root of 1990868495 is about 44619.1494204002. The cubic root of 1990868495 is about 1258.0006283050. Note that the first 3 decimals are identical.

The spelling of 1990868495 in words is "one billion, nine hundred ninety million, eight hundred sixty-eight thousand, four hundred ninety-five".