1540940491 has 16 divisors (see below), whose sum is σ = 1613571840. Its totient is φ = 1469694240.

The previous prime is 1540940483. The next prime is 1540940587. The reversal of 1540940491 is 1940490451.

It is a cyclic number.

It is not a de Polignac number, because 1540940491 - 2³ = 1540940483 is a prime.

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 1540940491.

It is not an unprimeable number, because it can be changed into a prime (1540140491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1957600 + ... + 1958386.

It is an arithmetic number, because the mean of its divisors is an integer number (100848240).

Almost surely, 2^1540940491 is an apocalyptic number.

1540940491 is a deficient number, since it is larger than the sum of its proper divisors (72631349).

1540940491 is a wasteful number, since it uses less digits than its factorization.

1540940491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1540940491 is about 39254.8148766492. The cubic root of 1540940491 is about 1155.0353845596.

The spelling of 1540940491 in words is "one billion, five hundred forty million, nine hundred forty thousand, four hundred ninety-one".