1820913969 has 16 divisors (see below), whose sum is σ = 2775352320. Its totient is φ = 1040287440.

The previous prime is 1820913953. The next prime is 1820913977. The reversal of 1820913969 is 9693190281.

It is not a de Polignac number, because 1820913969 - 2⁴ = 1820913953 is a prime.

It is a super-2 number, since 2×1820913969² = 6631455364998665922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1820913949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135964 + ... + 148754.

It is an arithmetic number, because the mean of its divisors is an integer number (173459520).

Almost surely, 2^1820913969 is an apocalyptic number.

It is an amenable number.

1820913969 is a deficient number, since it is larger than the sum of its proper divisors (954438351).

1820913969 is a wasteful number, since it uses less digits than its factorization.

1820913969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 1820913969 is about 42672.1685528167. The cubic root of 1820913969 is about 1221.1334912583.

The spelling of 1820913969 in words is "one billion, eight hundred twenty million, nine hundred thirteen thousand, nine hundred sixty-nine".