16440155 has 8 divisors (see below), whose sum is σ = 19769184. Its totient is φ = 13124800.

The previous prime is 16440133. The next prime is 16440161. The reversal of 16440155 is 55104461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16440155 - 2⁶ = 16440091 is a prime.

It is a super-3 number, since 3×16440155³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551 + ... + 5760.

It is an arithmetic number, because the mean of its divisors is an integer number (2471148).

Almost surely, 2^16440155 is an apocalyptic number.

16440155 is a deficient number, since it is larger than the sum of its proper divisors (3329029).

16440155 is an equidigital number, since it uses as much as digits as its factorization.

16440155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 16440155 is about 4054.6461004630. The cubic root of 16440155 is about 254.2740083495.

The spelling of 16440155 in words is "sixteen million, four hundred forty thousand, one hundred fifty-five".