16388290 has 16 divisors (see below), whose sum is σ = 29672568. Its totient is φ = 6516736.

The previous prime is 16388263. The next prime is 16388297. The reversal of 16388290 is 9288361.

It can be written as a sum of positive squares in 4 ways, for example, as 16265089 + 123201 = 4033^2 + 351^2 .

It is not an unprimeable number, because it can be changed into a prime (16388297) 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, 3007 + ... + 6466.

Almost surely, 2^16388290 is an apocalyptic number.

16388290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16388290 is a deficient number, since it is larger than the sum of its proper divisors (13284278).

16388290 is a wasteful number, since it uses less digits than its factorization.

16388290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9653.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 16388290 is about 4048.2452988919. The cubic root of 16388290 is about 254.0063341880.

The spelling of 16388290 in words is "sixteen million, three hundred eighty-eight thousand, two hundred ninety".