1890964869 has 4 divisors (see below), whose sum is σ = 2521286496. Its totient is φ = 1260643244.

The previous prime is 1890964853. The next prime is 1890964897. The reversal of 1890964869 is 9684690981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1890964869 - 2⁴ = 1890964853 is a prime.

It is a super-2 number, since 2×1890964869² = 7151496271584374322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890964469) 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, 315160809 + ... + 315160814.

It is an arithmetic number, because the mean of its divisors is an integer number (630321624).

Almost surely, 2^1890964869 is an apocalyptic number.

It is an amenable number.

1890964869 is a deficient number, since it is larger than the sum of its proper divisors (630321627).

1890964869 is an equidigital number, since it uses as much as digits as its factorization.

1890964869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630321626.

The product of its (nonzero) digits is 6718464, while the sum is 60.

The square root of 1890964869 is about 43485.2258704034. The cubic root of 1890964869 is about 1236.5959509972.

The spelling of 1890964869 in words is "one billion, eight hundred ninety million, nine hundred sixty-four thousand, eight hundred sixty-nine".