1542640865 has 8 divisors (see below), whose sum is σ = 1851821160. Its totient is φ = 1233677952.

The previous prime is 1542640849. The next prime is 1542640901. The reversal of 1542640865 is 5680462451.

It can be written as a sum of positive squares in 4 ways, for example, as 1163014609 + 379626256 = 34103^2 + 19484^2 .

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 1542640865 - 2⁴ = 1542640849 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, 38300 + ... + 67469.

It is an arithmetic number, because the mean of its divisors is an integer number (231477645).

Almost surely, 2^1542640865 is an apocalyptic number.

It is an amenable number.

1542640865 is a deficient number, since it is larger than the sum of its proper divisors (309180295).

1542640865 is a wasteful number, since it uses less digits than its factorization.

1542640865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108691.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 1542640865 is about 39276.4670636248. The cubic root of 1542640865 is about 1155.4600754529.

The spelling of 1542640865 in words is "one billion, five hundred forty-two million, six hundred forty thousand, eight hundred sixty-five".