1990902287 has 16 divisors (see below), whose sum is σ = 2344481280. Its totient is φ = 1671516000.

The previous prime is 1990902271. The next prime is 1990902293. The reversal of 1990902287 is 7822090991.

It is a happy number.

It is not a de Polignac number, because 1990902287 - 2⁴ = 1990902271 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 (1990902227) 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, 128339 + ... + 143012.

It is an arithmetic number, because the mean of its divisors is an integer number (146530080).

Almost surely, 2^1990902287 is an apocalyptic number.

1990902287 is a deficient number, since it is larger than the sum of its proper divisors (353578993).

1990902287 is a wasteful number, since it uses less digits than its factorization.

1990902287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271414.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 1990902287 is about 44619.5280902880. The cubic root of 1990902287 is about 1258.0077458212.

The spelling of 1990902287 in words is "one billion, nine hundred ninety million, nine hundred two thousand, two hundred eighty-seven".