13550399 has 4 divisors (see below), whose sum is σ = 13916664. Its totient is φ = 13184136.

The previous prime is 13550347. The next prime is 13550413. The reversal of 13550399 is 99305531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13550399 - 2⁸ = 13550143 is a prime.

It is a super-2 number, since 2×13550399² = 367226626118402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13550599) 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, 183077 + ... + 183150.

It is an arithmetic number, because the mean of its divisors is an integer number (3479166).

Almost surely, 2^13550399 is an apocalyptic number.

13550399 is a deficient number, since it is larger than the sum of its proper divisors (366265).

13550399 is an equidigital number, since it uses as much as digits as its factorization.

13550399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366264.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 13550399 is about 3681.0866602133. The cubic root of 13550399 is about 238.4060988091.

The spelling of 13550399 in words is "thirteen million, five hundred fifty thousand, three hundred ninety-nine".