1142409 has 4 divisors (see below), whose sum is σ = 1523216. Its totient is φ = 761604.

The previous prime is 1142389. The next prime is 1142423. The reversal of 1142409 is 9042411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1142409 is a prime.

It is a D-number.

It is a Duffinian number.

1142409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1142509) 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, 190399 + ... + 190404.

It is an arithmetic number, because the mean of its divisors is an integer number (380804).

2^1142409 is an apocalyptic number.

It is an amenable number.

1142409 is a deficient number, since it is larger than the sum of its proper divisors (380807).

1142409 is an equidigital number, since it uses as much as digits as its factorization.

1142409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380806.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1142409 is about 1068.8353474694. The cubic root of 1142409 is about 104.5379241640.

It can be divided in two parts, 1142 and 409, that added together give a palindrome (1551).

The spelling of 1142409 in words is "one million, one hundred forty-two thousand, four hundred nine".