16878401 has 6 divisors (see below), whose sum is σ = 17348310. Its totient is φ = 16420896.

The previous prime is 16878397. The next prime is 16878409. The reversal of 16878401 is 10487861.

It can be written as a sum of positive squares in 3 ways, for example, as 3519376 + 13359025 = 1876^2 + 3655^2 .

It is not a de Polignac number, because 16878401 - 2² = 16878397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16878409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4796 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (2891385).

Almost surely, 2^16878401 is an apocalyptic number.

It is an amenable number.

16878401 is a deficient number, since it is larger than the sum of its proper divisors (469909).

16878401 is an equidigital number, since it uses as much as digits as its factorization.

16878401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12403 (or 12366 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 16878401 is about 4108.3331169709. Note that the first 3 decimals coincide. The cubic root of 16878401 is about 256.5136223350.

The spelling of 16878401 in words is "sixteen million, eight hundred seventy-eight thousand, four hundred one".