13400442 has 24 divisors (see below), whose sum is σ = 31674240. Its totient is φ = 4060680.

The previous prime is 13400441. The next prime is 13400447. The reversal of 13400442 is 24400431.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (13400441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33642 + ... + 34037.

It is an arithmetic number, because the mean of its divisors is an integer number (1319760).

Almost surely, 2^13400442 is an apocalyptic number.

13400442 is an abundant number, since it is smaller than the sum of its proper divisors (18273798).

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

13400442 is a wasteful number, since it uses less digits than its factorization.

13400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67698 (or 67695 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13400442 is about 3660.6614156461. The cubic root of 13400442 is about 237.5233853243.

Adding to 13400442 its reverse (24400431), we get a palindrome (37800873).

The spelling of 13400442 in words is "thirteen million, four hundred thousand, four hundred forty-two".