1540423 has 2 divisors, whose sum is σ = 1540424. Its totient is φ = 1540422.

The previous prime is 1540403. The next prime is 1540447. The reversal of 1540423 is 3240451.

It is a weak prime.

It is an emirp because it is prime and its reverse (3240451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540423 - 2¹³ = 1532231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770211 + 770212.

It is an arithmetic number, because the mean of its divisors is an integer number (770212).

2^1540423 is an apocalyptic number.

1540423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540423 is an equidigital number, since it uses as much as digits as its factorization.

1540423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1540423 is about 1241.1377844542. The cubic root of 1540423 is about 115.4906072333.

Adding to 1540423 its reverse (3240451), we get a palindrome (4780874).

The spelling of 1540423 in words is "one million, five hundred forty thousand, four hundred twenty-three".