16640345 has 8 divisors (see below), whose sum is σ = 20657160. Its totient is φ = 12853120.

The previous prime is 16640329. The next prime is 16640347. The reversal of 16640345 is 54304661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26569 + 16613776 = 163^2 + 4076^2 .

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

It is not a de Polignac number, because 16640345 - 2⁴ = 16640329 is a prime.

It is a super-3 number, since 3×16640345³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (16640347) 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, 57236 + ... + 57525.

It is an arithmetic number, because the mean of its divisors is an integer number (2582145).

Almost surely, 2^16640345 is an apocalyptic number.

It is an amenable number.

16640345 is a deficient number, since it is larger than the sum of its proper divisors (4016815).

16640345 is a wasteful number, since it uses less digits than its factorization.

16640345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114795.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 16640345 is about 4079.2578981967. The cubic root of 16640345 is about 255.3019363364.

The spelling of 16640345 in words is "sixteen million, six hundred forty thousand, three hundred forty-five".