1540317402 has 72 divisors (see below), whose sum is σ = 3818093916. Its totient is φ = 446045184.

The previous prime is 1540317377. The next prime is 1540317407. The reversal of 1540317402 is 2047130451.

It can be written as a sum of positive squares in 6 ways, for example, as 1246160601 + 294156801 = 35301^2 + 17151^2 .

It is not an unprimeable number, because it can be changed into a prime (1540317407) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56238 + ... + 79014.

Almost surely, 2^1540317402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1540317402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909046958).

1540317402 is an abundant number, since it is smaller than the sum of its proper divisors (2277776514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1540317402 is a wasteful number, since it uses less digits than its factorization.

1540317402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22832 (or 22812 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1540317402 is about 39246.8776082888. The cubic root of 1540317402 is about 1154.8796816253.

Adding to 1540317402 its reverse (2047130451), we get a palindrome (3587447853).

The spelling of 1540317402 in words is "one billion, five hundred forty million, three hundred seventeen thousand, four hundred two".