16878457 has 2 divisors, whose sum is σ = 16878458. Its totient is φ = 16878456.

The previous prime is 16878451. The next prime is 16878461. The reversal of 16878457 is 75487861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16410601 + 467856 = 4051^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 16878457 - 2²³ = 8489849 is a prime.

It is not a weakly prime, because it can be changed into another prime (16878451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8439228 + 8439229.

It is an arithmetic number, because the mean of its divisors is an integer number (8439229).

Almost surely, 2^16878457 is an apocalyptic number.

It is an amenable number.

16878457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16878457 is an equidigital number, since it uses as much as digits as its factorization.

16878457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 46.

The square root of 16878457 is about 4108.3399323814. The cubic root of 16878457 is about 256.5139060259.

The spelling of 16878457 in words is "sixteen million, eight hundred seventy-eight thousand, four hundred fifty-seven".