16440730 has 8 divisors (see below), whose sum is σ = 29593332. Its totient is φ = 6576288.

The previous prime is 16440727. The next prime is 16440731. The reversal of 16440730 is 3704461.

It can be written as a sum of positive squares in 2 ways, for example, as 16152361 + 288369 = 4019^2 + 537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×16440730³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16440695 and 16440704.

It is not an unprimeable number, because it can be changed into a prime (16440731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822027 + ... + 822046.

Almost surely, 2^16440730 is an apocalyptic number.

16440730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16440730 is a deficient number, since it is larger than the sum of its proper divisors (13152602).

16440730 is a wasteful number, since it uses less digits than its factorization.

16440730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644080.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 16440730 is about 4054.7170061547. The cubic root of 16440730 is about 254.2769727548.

The spelling of 16440730 in words is "sixteen million, four hundred forty thousand, seven hundred thirty".