16505390 has 32 divisors (see below), whose sum is σ = 32628960. Its totient is φ = 5961600.

The previous prime is 16505389. The next prime is 16505399. The reversal of 16505390 is 9350561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19496 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (1019655).

Almost surely, 2^16505390 is an apocalyptic number.

16505390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16505390 is a deficient number, since it is larger than the sum of its proper divisors (16123570).

16505390 is a wasteful number, since it uses less digits than its factorization.

16505390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 16505390 is about 4062.6826112804. The cubic root of 16505390 is about 254.6098866345.

The spelling of 16505390 in words is "sixteen million, five hundred five thousand, three hundred ninety".