1540435813 has 4 divisors (see below), whose sum is σ = 1760498080. Its totient is φ = 1320373548.

The previous prime is 1540435783. The next prime is 1540435843. The reversal of 1540435813 is 3185340451.

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: 3185340451 = 1801 ⋅1768651.

It is an interprime number because it is at equal distance from previous prime (1540435783) and next prime (1540435843).

It is a cyclic number.

It is not a de Polignac number, because 1540435813 - 2⁵ = 1540435781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540435843) 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, 110031123 + ... + 110031136.

It is an arithmetic number, because the mean of its divisors is an integer number (440124520).

Almost surely, 2^1540435813 is an apocalyptic number.

It is an amenable number.

1540435813 is a deficient number, since it is larger than the sum of its proper divisors (220062267).

1540435813 is an equidigital number, since it uses as much as digits as its factorization.

1540435813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220062266.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1540435813 is about 39248.3861196865. The cubic root of 1540435813 is about 1154.9092744339.

The spelling of 1540435813 in words is "one billion, five hundred forty million, four hundred thirty-five thousand, eight hundred thirteen".