16891004 has 24 divisors (see below), whose sum is σ = 32078928. Its totient is φ = 7735680.

The previous prime is 16891003. The next prime is 16891031. The reversal of 16891004 is 40019861.

It is a super-2 number, since 2×16891004² = 570612032256032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16891003) 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, 5939 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (1336622).

Almost surely, 2^16891004 is an apocalyptic number.

It is an amenable number.

16891004 is a deficient number, since it is larger than the sum of its proper divisors (15187924).

16891004 is a wasteful number, since it uses less digits than its factorization.

16891004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16891004 is about 4109.8666645038. The cubic root of 16891004 is about 256.5774521742.

The spelling of 16891004 in words is "sixteen million, eight hundred ninety-one thousand, four".