1540135640 has 16 divisors (see below), whose sum is σ = 3465305280. Its totient is φ = 616054240.

The previous prime is 1540135613. The next prime is 1540135651. The reversal of 1540135640 is 465310451.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19251656 + ... + 19251735.

It is an arithmetic number, because the mean of its divisors is an integer number (216581580).

Almost surely, 2^1540135640 is an apocalyptic number.

1540135640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540135640 is an abundant number, since it is smaller than the sum of its proper divisors (1925169640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1540135640 is a wasteful number, since it uses less digits than its factorization.

1540135640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38503402 (or 38503398 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1540135640 is about 39244.5619162706. The cubic root of 1540135640 is about 1154.8342534346.

The spelling of 1540135640 in words is "one billion, five hundred forty million, one hundred thirty-five thousand, six hundred forty".