1897904090 has 8 divisors (see below), whose sum is σ = 3416227380. Its totient is φ = 759161632.

The previous prime is 1897904017. The next prime is 1897904093. The reversal of 1897904090 is 904097981.

It can be written as a sum of positive squares in 2 ways, for example, as 1823375401 + 74528689 = 42701^2 + 8633^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1897904093) 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, 94895195 + ... + 94895214.

Almost surely, 2^1897904090 is an apocalyptic number.

1897904090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1897904090 is a deficient number, since it is larger than the sum of its proper divisors (1518323290).

1897904090 is a wasteful number, since it uses less digits than its factorization.

1897904090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189790416.

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

The square root of 1897904090 is about 43564.9410650353. The cubic root of 1897904090 is about 1238.1067383521.

The spelling of 1897904090 in words is "one billion, eight hundred ninety-seven million, nine hundred four thousand, ninety".