13400550 has 72 divisors (see below), whose sum is σ = 36492456. Its totient is φ = 3525120.

The previous prime is 13400509. The next prime is 13400551. The reversal of 13400550 is 5500431.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43497 + ... + 43803.

Almost surely, 2^13400550 is an apocalyptic number.

13400550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13400550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18246228).

13400550 is an abundant number, since it is smaller than the sum of its proper divisors (23091906).

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

13400550 is a wasteful number, since it uses less digits than its factorization.

13400550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 13400550 is about 3660.6761670489. The cubic root of 13400550 is about 237.5240234240.

Adding to 13400550 its reverse (5500431), we get a palindrome (18900981).

The spelling of 13400550 in words is "thirteen million, four hundred thousand, five hundred fifty".