1540396985 has 8 divisors (see below), whose sum is σ = 1848899520. Its totient is φ = 1232035504.

The previous prime is 1540396967. The next prime is 1540396993. The reversal of 1540396985 is 5896930451.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1540396985 - 2⁸ = 1540396729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9527 + ... + 56316.

It is an arithmetic number, because the mean of its divisors is an integer number (231112440).

Almost surely, 2^1540396985 is an apocalyptic number.

It is an amenable number.

1540396985 is a deficient number, since it is larger than the sum of its proper divisors (308502535).

1540396985 is an equidigital number, since it uses as much as digits as its factorization.

1540396985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70527.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 1540396985 is about 39247.8914720269. The cubic root of 1540396985 is about 1154.8995708609.

The spelling of 1540396985 in words is "one billion, five hundred forty million, three hundred ninety-six thousand, nine hundred eighty-five".