16404457 has 8 divisors (see below), whose sum is σ = 17145216. Its totient is φ = 15680112.

The previous prime is 16404449. The next prime is 16404461. The reversal of 16404457 is 75440461.

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 16404457 - 2³ = 16404449 is a prime.

It is a super-6 number, since 6×16404457⁶ (a number of 45 digits) contains 666666 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16404757) 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, 2038 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (2143152).

Almost surely, 2^16404457 is an apocalyptic number.

It is an amenable number.

16404457 is a deficient number, since it is larger than the sum of its proper divisors (740759).

16404457 is an equidigital number, since it uses as much as digits as its factorization.

16404457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8207.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 16404457 is about 4050.2415977322. The cubic root of 16404457 is about 254.0898322383.

It can be divided in two parts, 16404 and 457, that added together give a palindrome (16861).

The spelling of 16404457 in words is "sixteen million, four hundred four thousand, four hundred fifty-seven".