1997287490 has 16 divisors (see below), whose sum is σ = 3921946560. Its totient is φ = 726286320.

The previous prime is 1997287477. The next prime is 1997287511. The reversal of 1997287490 is 947827991.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9078470 + ... + 9078689.

It is an arithmetic number, because the mean of its divisors is an integer number (245121660).

Almost surely, 2^1997287490 is an apocalyptic number.

1997287490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997287490 is a deficient number, since it is larger than the sum of its proper divisors (1924659070).

1997287490 is a wasteful number, since it uses less digits than its factorization.

1997287490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18157177.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The square root of 1997287490 is about 44691.0224765556. The cubic root of 1997287490 is about 1259.3512007891.

The spelling of 1997287490 in words is "one billion, nine hundred ninety-seven million, two hundred eighty-seven thousand, four hundred ninety".