13402440 has 96 divisors (see below), whose sum is σ = 44366400. Its totient is φ = 3507840.

The previous prime is 13402427. The next prime is 13402453. The reversal of 13402440 is 4420431.

It is an interprime number because it is at equal distance from previous prime (13402427) and next prime (13402453).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20925 + ... + 21555.

It is an arithmetic number, because the mean of its divisors is an integer number (462150).

Almost surely, 2^13402440 is an apocalyptic number.

13402440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13402440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22183200).

13402440 is an abundant number, since it is smaller than the sum of its proper divisors (30963960).

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

13402440 is a wasteful number, since it uses less digits than its factorization.

13402440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 700 counting only the distinct ones).

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

The square root of 13402440 is about 3660.9343069768. The cubic root of 13402440 is about 237.5351896150.

Adding to 13402440 its reverse (4420431), we get a palindrome (17822871).

Subtracting from 13402440 its reverse (4420431), we obtain a square (8982009 = 2997²).

The spelling of 13402440 in words is "thirteen million, four hundred two thousand, four hundred forty".