1540442 has 8 divisors (see below), whose sum is σ = 2319732. Its totient is φ = 767200.

The previous prime is 1540423. The next prime is 1540447. The reversal of 1540442 is 2440451.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 361 = 1241^2 + 19^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1540447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809 + ... + 1932.

2^1540442 is an apocalyptic number.

1540442 is a deficient number, since it is larger than the sum of its proper divisors (779290).

1540442 is a wasteful number, since it uses less digits than its factorization.

1540442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1540442 is about 1241.1454386977. The cubic root of 1540442 is about 115.4910820623.

Adding to 1540442 its reverse (2440451), we get a palindrome (3980893).

Subtracting 1540442 from its reverse (2440451), we obtain a palindrome (900009).

The spelling of 1540442 in words is "one million, five hundred forty thousand, four hundred forty-two".