16390420 has 24 divisors (see below), whose sum is σ = 34549704. Its totient is φ = 6531456.

The previous prime is 16390417. The next prime is 16390427. The reversal of 16390420 is 2409361.

It can be written as a sum of positive squares in 4 ways, for example, as 7160976 + 9229444 = 2676^2 + 3038^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16390427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4462 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (1439571).

Almost surely, 2^16390420 is an apocalyptic number.

16390420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16390420 is an abundant number, since it is smaller than the sum of its proper divisors (18159284).

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

16390420 is a wasteful number, since it uses less digits than its factorization.

16390420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099 (or 3097 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16390420 is about 4048.5083672879. The cubic root of 16390420 is about 254.0173381845.

Adding to 16390420 its reverse (2409361), we get a palindrome (18799781).

It can be divided in two parts, 163904 and 20, that multiplied together give a triangular number (3278080 = T₂₅₆₀).

The spelling of 16390420 in words is "sixteen million, three hundred ninety thousand, four hundred twenty".