16399605 has 8 divisors (see below), whose sum is σ = 26239392. Its totient is φ = 8746448.

The previous prime is 16399601. The next prime is 16399609. The reversal of 16399605 is 50699361.

It is an interprime number because it is at equal distance from previous prime (16399601) and next prime (16399609).

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

It is a cyclic number.

It is not a de Polignac number, because 16399605 - 2² = 16399601 is a prime.

It is a super-4 number, since 4×16399605⁴ (a number of 30 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399601) 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, 546639 + ... + 546668.

It is an arithmetic number, because the mean of its divisors is an integer number (3279924).

Almost surely, 2^16399605 is an apocalyptic number.

16399605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16399605 is a deficient number, since it is larger than the sum of its proper divisors (9839787).

16399605 is a wasteful number, since it uses less digits than its factorization.

16399605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093315.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 16399605 is about 4049.6425768208. The cubic root of 16399605 is about 254.0647787740.

The spelling of 16399605 in words is "sixteen million, three hundred ninety-nine thousand, six hundred five".