13440402 has 24 divisors (see below), whose sum is σ = 29742336. Its totient is φ = 4384536.

The previous prime is 13440397. The next prime is 13440407. The reversal of 13440402 is 20404431.

It is an interprime number because it is at equal distance from previous prime (13440397) and next prime (13440407).

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 (13440407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7098 + ... + 8789.

It is an arithmetic number, because the mean of its divisors is an integer number (1239264).

Almost surely, 2^13440402 is an apocalyptic number.

13440402 is an abundant number, since it is smaller than the sum of its proper divisors (16301934).

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

13440402 is a wasteful number, since it uses less digits than its factorization.

13440402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942 (or 15939 counting only the distinct ones).

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

The square root of 13440402 is about 3666.1153827996. The cubic root of 13440402 is about 237.7592485796.

Adding to 13440402 its reverse (20404431), we get a palindrome (33844833).

The spelling of 13440402 in words is "thirteen million, four hundred forty thousand, four hundred two".