1813481 has 8 divisors (see below), whose sum is σ = 1944384. Its totient is φ = 1686960.

The previous prime is 1813477. The next prime is 1813499. The reversal of 1813481 is 1843181.

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

It is a cyclic number.

It is not a de Polignac number, because 1813481 - 2² = 1813477 is a prime.

It is a super-2 number, since 2×1813481² = 6577426674722, 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 1813481.

It is not an unprimeable number, because it can be changed into a prime (1813421) 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, 215 + ... + 1916.

It is an arithmetic number, because the mean of its divisors is an integer number (243048).

2^1813481 is an apocalyptic number.

It is an amenable number.

1813481 is a deficient number, since it is larger than the sum of its proper divisors (130903).

1813481 is a wasteful number, since it uses less digits than its factorization.

1813481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191.

The product of its digits is 768, while the sum is 26.

The square root of 1813481 is about 1346.6554867523. The cubic root of 1813481 is about 121.9469670065.

The spelling of 1813481 in words is "one million, eight hundred thirteen thousand, four hundred eighty-one".