16840057 has 4 divisors (see below), whose sum is σ = 18135460. Its totient is φ = 15544656.

The previous prime is 16840009. The next prime is 16840067. The reversal of 16840057 is 75004861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6497401 + 10342656 = 2549^2 + 3216^2 .

It is a cyclic number.

It is not a de Polignac number, because 16840057 - 2⁷ = 16839929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16840067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647682 + ... + 647707.

It is an arithmetic number, because the mean of its divisors is an integer number (4533865).

Almost surely, 2^16840057 is an apocalyptic number.

It is an amenable number.

16840057 is a deficient number, since it is larger than the sum of its proper divisors (1295403).

16840057 is a wasteful number, since it uses less digits than its factorization.

16840057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295402.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 16840057 is about 4103.6638507558. The cubic root of 16840057 is about 256.3192276177.

The spelling of 16840057 in words is "sixteen million, eight hundred forty thousand, fifty-seven".