1812464977 has 4 divisors (see below), whose sum is σ = 1817124660. Its totient is φ = 1807805296.

The previous prime is 1812464963. The next prime is 1812464981. The reversal of 1812464977 is 7794642181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7794642181 = 67 ⋅116337943.

It can be written as a sum of positive squares in 2 ways, for example, as 731107521 + 1081357456 = 27039^2 + 32884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812464977 - 2¹¹ = 1812462929 is a prime.

It is a super-2 number, since 2×1812464977² = 6570058585703221058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1812464977.

It is not an unprimeable number, because it can be changed into a prime (1812464917) 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, 2329258 + ... + 2330035.

It is an arithmetic number, because the mean of its divisors is an integer number (454281165).

Almost surely, 2^1812464977 is an apocalyptic number.

It is an amenable number.

1812464977 is a deficient number, since it is larger than the sum of its proper divisors (4659683).

1812464977 is an equidigital number, since it uses as much as digits as its factorization.

1812464977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659682.

The product of its digits is 677376, while the sum is 49.

The square root of 1812464977 is about 42573.0545885540. The cubic root of 1812464977 is about 1219.2418870162.

The spelling of 1812464977 in words is "one billion, eight hundred twelve million, four hundred sixty-four thousand, nine hundred seventy-seven".