1540013 has 8 divisors (see below), whose sum is σ = 1643832. Its totient is φ = 1437696.

The previous prime is 1540009. The next prime is 1540027. The reversal of 1540013 is 3100451.

1540013 = 877² + 878².

It can be written as a sum of positive squares in 4 ways, for example, as 769129 + 770884 = 877^2 + 878^2 .

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 1540013 - 2² = 1540009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2381 + ... + 2957.

It is an arithmetic number, because the mean of its divisors is an integer number (205479).

2^1540013 is an apocalyptic number.

1540013 is the 878-th centered square number.

It is an amenable number.

1540013 is a deficient number, since it is larger than the sum of its proper divisors (103819).

1540013 is a wasteful number, since it uses less digits than its factorization.

1540013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1540013 is about 1240.9726024373. The cubic root of 1540013 is about 115.4803599721.

Adding to 1540013 its reverse (3100451), we get a palindrome (4640464).

The spelling of 1540013 in words is "one million, five hundred forty thousand, thirteen".