1812945957 has 8 divisors (see below), whose sum is σ = 2447859840. Its totient is φ = 1193331360.

The previous prime is 1812945929. The next prime is 1812945961. The reversal of 1812945957 is 7595492181.

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

It is not a de Polignac number, because 1812945957 - 2¹⁰ = 1812944933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812945907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3824544 + ... + 3825017.

It is an arithmetic number, because the mean of its divisors is an integer number (305982480).

Almost surely, 2^1812945957 is an apocalyptic number.

It is an amenable number.

1812945957 is a deficient number, since it is larger than the sum of its proper divisors (634913883).

1812945957 is an equidigital number, since it uses as much as digits as its factorization.

1812945957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649643.

The product of its digits is 907200, while the sum is 51.

The square root of 1812945957 is about 42578.7030920389. The cubic root of 1812945957 is about 1219.3497289337.

The spelling of 1812945957 in words is "one billion, eight hundred twelve million, nine hundred forty-five thousand, nine hundred fifty-seven".