16243657 has 8 divisors (see below), whose sum is σ = 16518600. Its totient is φ = 15970944.

The previous prime is 16243649. The next prime is 16243663. The reversal of 16243657 is 75634261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3455881 + 12787776 = 1859^2 + 3576^2 .

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 16243657 - 2³ = 16243649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16243697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19983 + ... + 20779.

It is an arithmetic number, because the mean of its divisors is an integer number (2064825).

Almost surely, 2^16243657 is an apocalyptic number.

It is an amenable number.

16243657 is a deficient number, since it is larger than the sum of its proper divisors (274943).

16243657 is an equidigital number, since it uses as much as digits as its factorization.

16243657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115.

The product of its digits is 30240, while the sum is 34.

The square root of 16243657 is about 4030.3420450379. The cubic root of 16243657 is about 253.2568904092.

It can be divided in two parts, 16243 and 657, that added together give a square (16900 = 130²).

The spelling of 16243657 in words is "sixteen million, two hundred forty-three thousand, six hundred fifty-seven".