16155399 has 8 divisors (see below), whose sum is σ = 23197552. Its totient is φ = 9941760.

The previous prime is 16155397. The next prime is 16155409. The reversal of 16155399 is 99355161.

16155399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16155399 - 2¹ = 16155397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 414241 = 16155399 / (1 + 6 + 1 + 5 + 5 + 3 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16155397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207082 + ... + 207159.

It is an arithmetic number, because the mean of its divisors is an integer number (2899694).

Almost surely, 2^16155399 is an apocalyptic number.

16155399 is a deficient number, since it is larger than the sum of its proper divisors (7042153).

16155399 is a wasteful number, since it uses less digits than its factorization.

16155399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414257.

The product of its digits is 36450, while the sum is 39.

The square root of 16155399 is about 4019.3779369450. The cubic root of 16155399 is about 252.7973766535.

It can be divided in two parts, 16155 and 399, that multiplied together give a triangular number (6445845 = T₃₅₉₀).

The spelling of 16155399 in words is "sixteen million, one hundred fifty-five thousand, three hundred ninety-nine".