1540620497 has 8 divisors (see below), whose sum is σ = 1674352680. Its totient is φ = 1409063040.

The previous prime is 1540620493. The next prime is 1540620503. The reversal of 1540620497 is 7940260451.

It can be written as a sum of positive squares in 4 ways, for example, as 150896656 + 1389723841 = 12284^2 + 37279^2 .

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 1540620497 - 2² = 1540620493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540620497.

It is not an unprimeable number, because it can be changed into a prime (1540620493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542204 + ... + 545037.

It is an arithmetic number, because the mean of its divisors is an integer number (209294085).

Almost surely, 2^1540620497 is an apocalyptic number.

It is an amenable number.

1540620497 is a deficient number, since it is larger than the sum of its proper divisors (133732183).

1540620497 is a wasteful number, since it uses less digits than its factorization.

1540620497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087363.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1540620497 is about 39250.7388083333. The cubic root of 1540620497 is about 1154.9554269013.

The spelling of 1540620497 in words is "one billion, five hundred forty million, six hundred twenty thousand, four hundred ninety-seven".