16621404 has 12 divisors (see below), whose sum is σ = 38783304. Its totient is φ = 5540464.

The previous prime is 16621391. The next prime is 16621417. The reversal of 16621404 is 40412661.

It is an interprime number because it is at equal distance from previous prime (16621391) and next prime (16621417).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692547 + ... + 692570.

It is an arithmetic number, because the mean of its divisors is an integer number (3231942).

Almost surely, 2^16621404 is an apocalyptic number.

It is an amenable number.

16621404 is an abundant number, since it is smaller than the sum of its proper divisors (22161900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16621404 is a wasteful number, since it uses less digits than its factorization.

16621404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385124 (or 1385122 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16621404 is about 4076.9356139140. The cubic root of 16621404 is about 255.2050330994.

The spelling of 16621404 in words is "sixteen million, six hundred twenty-one thousand, four hundred four".