16556390 has 32 divisors (see below), whose sum is σ = 31682880. Its totient is φ = 6217344.

The previous prime is 16556381. The next prime is 16556443. The reversal of 16556390 is 9365561.

It is a super-2 number, since 2×16556390² = 548228099664200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16556390.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9959 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (990090).

Almost surely, 2^16556390 is an apocalyptic number.

16556390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16556390 is a deficient number, since it is larger than the sum of its proper divisors (15126490).

16556390 is a wasteful number, since it uses less digits than its factorization.

16556390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 16556390 is about 4068.9544111479. The cubic root of 16556390 is about 254.8718566718.

The spelling of 16556390 in words is "sixteen million, five hundred fifty-six thousand, three hundred ninety".