1540406 has 16 divisors (see below), whose sum is σ = 2780160. Its totient is φ = 625320.

The previous prime is 1540403. The next prime is 1540423. The reversal of 1540406 is 6040451.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540403) 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, 2630 + ... + 3161.

It is an arithmetic number, because the mean of its divisors is an integer number (173760).

2^1540406 is an apocalyptic number.

1540406 is a deficient number, since it is larger than the sum of its proper divisors (1239754).

1540406 is a wasteful number, since it uses less digits than its factorization.

1540406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1540406 is about 1241.1309358807. The cubic root of 1540406 is about 115.4901823830.

Adding to 1540406 its reverse (6040451), we get a palindrome (7580857).

The spelling of 1540406 in words is "one million, five hundred forty thousand, four hundred six".