11142440 has 16 divisors (see below), whose sum is σ = 25070580. Its totient is φ = 4456960.

The previous prime is 11142427. The next prime is 11142449. The reversal of 11142440 is 4424111.

It can be written as a sum of positive squares in 2 ways, for example, as 11142244 + 196 = 3338^2 + 14^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11142449) 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, 139241 + ... + 139320.

Almost surely, 2^11142440 is an apocalyptic number.

11142440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11142440 is an abundant number, since it is smaller than the sum of its proper divisors (13928140).

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

11142440 is a wasteful number, since it uses less digits than its factorization.

11142440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278572 (or 278568 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 11142440 is about 3338.0293587684. The cubic root of 11142440 is about 223.3538457930.

Adding to 11142440 its reverse (4424111), we get a palindrome (15566551).

The spelling of 11142440 in words is "eleven million, one hundred forty-two thousand, four hundred forty".