1813840741 has 4 divisors (see below), whose sum is σ = 1816520652. Its totient is φ = 1811160832.

The previous prime is 1813840729. The next prime is 1813840759. The reversal of 1813840741 is 1470483181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1793183716 + 20657025 = 42346^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813840741 - 2²¹ = 1811743589 is a prime.

It is a super-2 number, since 2×1813840741² = 6580036467422858162, 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 1813840741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813840771) 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, 1338940 + ... + 1340293.

It is an arithmetic number, because the mean of its divisors is an integer number (454130163).

Almost surely, 2^1813840741 is an apocalyptic number.

It is an amenable number.

1813840741 is a deficient number, since it is larger than the sum of its proper divisors (2679911).

1813840741 is an equidigital number, since it uses as much as digits as its factorization.

1813840741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679910.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1813840741 is about 42589.2092084368. The cubic root of 1813840741 is about 1219.5503003068.

The spelling of 1813840741 in words is "one billion, eight hundred thirteen million, eight hundred forty thousand, seven hundred forty-one".