16404861 has 8 divisors (see below), whose sum is σ = 23861664. Its totient is φ = 9942320.

The previous prime is 16404851. The next prime is 16404863. The reversal of 16404861 is 16840461.

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 16404861 - 2¹⁸ = 16142717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404863) 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, 248526 + ... + 248591.

It is an arithmetic number, because the mean of its divisors is an integer number (2982708).

Almost surely, 2^16404861 is an apocalyptic number.

16404861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16404861 is a deficient number, since it is larger than the sum of its proper divisors (7456803).

16404861 is a wasteful number, since it uses less digits than its factorization.

16404861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497131.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 16404861 is about 4050.2914709932. The cubic root of 16404861 is about 254.0919180830.

Subtracting 16404861 from its reverse (16840461), we obtain a square (435600 = 660²).

The spelling of 16404861 in words is "sixteen million, four hundred four thousand, eight hundred sixty-one".