16440345 has 24 divisors (see below), whose sum is σ = 28781376. Its totient is φ = 8680608.

The previous prime is 16440337. The next prime is 16440349. The reversal of 16440345 is 54304461.

It is not a de Polignac number, because 16440345 - 2³ = 16440337 is a prime.

It is a super-3 number, since 3×16440345³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16440349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2862 + ... + 6408.

It is an arithmetic number, because the mean of its divisors is an integer number (1199224).

Almost surely, 2^16440345 is an apocalyptic number.

16440345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16440345 is a deficient number, since it is larger than the sum of its proper divisors (12341031).

16440345 is a wasteful number, since it uses less digits than its factorization.

16440345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3658 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 16440345 is about 4054.6695303070. The cubic root of 16440345 is about 254.2749878998.

The spelling of 16440345 in words is "sixteen million, four hundred forty thousand, three hundred forty-five".