30440286 has 40 divisors (see below), whose sum is σ = 69887664. Its totient is φ = 9897120.

The previous prime is 30440269. The next prime is 30440287. The reversal of 30440286 is 68204403.

It is a super-2 number, since 2×30440286² = 1853222023523592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30440287) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4351 + ... + 8933.

Almost surely, 2^30440286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30440286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34943832).

30440286 is an abundant number, since it is smaller than the sum of its proper divisors (39447378).

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

30440286 is a wasteful number, since it uses less digits than its factorization.

30440286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4638 (or 4629 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 30440286 is about 5517.2716083224. The cubic root of 30440286 is about 312.2359531698.

Adding to 30440286 its reverse (68204403), we get a palindrome (98644689).

The spelling of 30440286 in words is "thirty million, four hundred forty thousand, two hundred eighty-six".