1896975649 has 4 divisors (see below), whose sum is σ = 1897077636. Its totient is φ = 1896873664.

The previous prime is 1896975593. The next prime is 1896975679. The reversal of 1896975649 is 9465796981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9465796981 = 199 ⋅47566819.

It can be written as a sum of positive squares in 2 ways, for example, as 1686580624 + 210395025 = 41068^2 + 14505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1896975649 - 2¹⁷ = 1896844577 is a prime.

It is a super-2 number, since 2×1896975649² = 7197033225797942402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1896975679) 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, 14284 + ... + 63229.

It is an arithmetic number, because the mean of its divisors is an integer number (474269409).

Almost surely, 2^1896975649 is an apocalyptic number.

It is an amenable number.

1896975649 is a deficient number, since it is larger than the sum of its proper divisors (101987).

1896975649 is an equidigital number, since it uses as much as digits as its factorization.

1896975649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101986.

The product of its digits is 29393280, while the sum is 64.

The square root of 1896975649 is about 43554.2839339599. The cubic root of 1896975649 is about 1237.9048144581.

The spelling of 1896975649 in words is "one billion, eight hundred ninety-six million, nine hundred seventy-five thousand, six hundred forty-nine".