1812907949 has 4 divisors (see below), whose sum is σ = 1817000736. Its totient is φ = 1808815164.

The previous prime is 1812907919. The next prime is 1812907951. The reversal of 1812907949 is 9497092181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9497092181 = 157 ⋅60491033.

It is a cyclic number.

It is not a de Polignac number, because 1812907949 - 2¹² = 1812903853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812907897 and 1812907906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812907919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045729 + ... + 2046614.

It is an arithmetic number, because the mean of its divisors is an integer number (454250184).

Almost surely, 2^1812907949 is an apocalyptic number.

It is an amenable number.

1812907949 is a deficient number, since it is larger than the sum of its proper divisors (4092787).

1812907949 is an equidigital number, since it uses as much as digits as its factorization.

1812907949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092786.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 1812907949 is about 42578.2567632824. The cubic root of 1812907949 is about 1219.3412077442.

The spelling of 1812907949 in words is "one billion, eight hundred twelve million, nine hundred seven thousand, nine hundred forty-nine".