16391445 has 16 divisors (see below), whose sum is σ = 29973120. Its totient is φ = 7493184.

The previous prime is 16391423. The next prime is 16391447. The reversal of 16391445 is 54419361.

It is not a de Polignac number, because 16391445 - 2⁵ = 16391413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77950 + ... + 78159.

It is an arithmetic number, because the mean of its divisors is an integer number (1873320).

Almost surely, 2^16391445 is an apocalyptic number.

16391445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16391445 is a deficient number, since it is larger than the sum of its proper divisors (13581675).

16391445 is a wasteful number, since it uses less digits than its factorization.

16391445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156124.

The product of its digits is 12960, while the sum is 33.

The square root of 16391445 is about 4048.6349551423. The cubic root of 16391445 is about 254.0226331951.

It can be divided in two parts, 16391 and 445, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 16391445 in words is "sixteen million, three hundred ninety-one thousand, four hundred forty-five".