1540812999 has 32 divisors (see below), whose sum is σ = 2372348160. Its totient is φ = 879724800.

The previous prime is 1540812983. The next prime is 1540813009. The reversal of 1540812999 is 9992180451.

It is not a de Polignac number, because 1540812999 - 2⁴ = 1540812983 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540811999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106699 + ... + 120275.

It is an arithmetic number, because the mean of its divisors is an integer number (74135880).

Almost surely, 2^1540812999 is an apocalyptic number.

1540812999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1540812999 is a deficient number, since it is larger than the sum of its proper divisors (831535161).

1540812999 is a wasteful number, since it uses less digits than its factorization.

1540812999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13791.

The product of its (nonzero) digits is 233280, while the sum is 48.

The square root of 1540812999 is about 39253.1909403554. The cubic root of 1540812999 is about 1155.0035291585.

It can be divided in two parts, 154081 and 2999, that added together give a triangular number (157080 = T₅₆₀).

The spelling of 1540812999 in words is "one billion, five hundred forty million, eight hundred twelve thousand, nine hundred ninety-nine".