16390458 has 64 divisors (see below), whose sum is σ = 42071040. Its totient is φ = 4633200.

The previous prime is 16390457. The next prime is 16390459. The reversal of 16390458 is 85409361.

It is an interprime number because it is at equal distance from previous prime (16390457) and next prime (16390459).

It is a super-2 number, since 2×16390458² = 537294226899528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16390453) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 49353 + ... + 49683.

It is an arithmetic number, because the mean of its divisors is an integer number (657360).

Almost surely, 2^16390458 is an apocalyptic number.

16390458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16390458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21035520).

16390458 is an abundant number, since it is smaller than the sum of its proper divisors (25680582).

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

16390458 is a wasteful number, since it uses less digits than its factorization.

16390458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 16390458 is about 4048.5130603717. The cubic root of 16390458 is about 254.0175344912.

The spelling of 16390458 in words is "sixteen million, three hundred ninety thousand, four hundred fifty-eight".