906181812 has 18 divisors (see below), whose sum is σ = 2290626338. Its totient is φ = 302060592.

The previous prime is 906181811. The next prime is 906181831. The reversal of 906181812 is 218181609.

It can be written as a sum of positive squares in only one way, i.e., 775399716 + 130782096 = 27846^2 + 11436^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 25171717 = 906181812 / (9 + 0 + 6 + 1 + 8 + 1 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906181811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12585823 + ... + 12585894.

Almost surely, 2^906181812 is an apocalyptic number.

It is an amenable number.

906181812 is an abundant number, since it is smaller than the sum of its proper divisors (1384444526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

906181812 is a wasteful number, since it uses less digits than its factorization.

906181812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25171727 (or 25171722 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 906181812 is about 30102.8538846402. The cubic root of 906181812 is about 967.6948885288.

The spelling of 906181812 in words is "nine hundred six million, one hundred eighty-one thousand, eight hundred twelve".