1869990869 has 4 divisors (see below), whose sum is σ = 1870683360. Its totient is φ = 1869298380.

The previous prime is 1869990817. The next prime is 1869990877. The reversal of 1869990869 is 9680999681.

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 1869990869 - 2¹² = 1869986773 is a prime.

It is a super-2 number, since 2×1869990869² = 6993731700286750322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869993869) 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, 342179 + ... + 347600.

It is an arithmetic number, because the mean of its divisors is an integer number (467670840).

Almost surely, 2^1869990869 is an apocalyptic number.

It is an amenable number.

1869990869 is a deficient number, since it is larger than the sum of its proper divisors (692491).

1869990869 is an equidigital number, since it uses as much as digits as its factorization.

1869990869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692490.

The product of its (nonzero) digits is 15116544, while the sum is 65.

The square root of 1869990869 is about 43243.3910441815. The cubic root of 1869990869 is about 1232.0069619009.

The spelling of 1869990869 in words is "one billion, eight hundred sixty-nine million, nine hundred ninety thousand, eight hundred sixty-nine".