1540640990 has 16 divisors (see below), whose sum is σ = 3169318752. Its totient is φ = 528219744.

The previous prime is 1540640977. The next prime is 1540641017. The reversal of 1540640990 is 990460451.

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 7 ways as a sum of consecutive naturals, for example, 11004509 + ... + 11004648.

It is an arithmetic number, because the mean of its divisors is an integer number (198082422).

Almost surely, 2^1540640990 is an apocalyptic number.

1540640990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540640990 is an abundant number, since it is smaller than the sum of its proper divisors (1628677762).

1540640990 is a wasteful number, since it uses less digits than its factorization.

1540640990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22009171.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1540640990 is about 39250.9998598762. Note that the first 3 decimals coincide. The cubic root of 1540640990 is about 1154.9605478675.

The spelling of 1540640990 in words is "one billion, five hundred forty million, six hundred forty thousand, nine hundred ninety".