30381156 has 60 divisors (see below), whose sum is σ = 85543612. Its totient is φ = 9346752.

The previous prime is 30381149. The next prime is 30381157. The reversal of 30381156 is 65118303.

It can be written as a sum of positive squares in 2 ways, for example, as 14699556 + 15681600 = 3834^2 + 3960^2 .

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

It is not an unprimeable number, because it can be changed into a prime (30381157) 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 19 ways as a sum of consecutive naturals, for example, 606 + ... + 7818.

Almost surely, 2^30381156 is an apocalyptic number.

30381156 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30381156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42771806).

30381156 is an abundant number, since it is smaller than the sum of its proper divisors (55162456).

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

30381156 is a wasteful number, since it uses less digits than its factorization.

30381156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 30381156 is about 5511.9103766299. The cubic root of 30381156 is about 312.0336502167.

Adding to 30381156 its reverse (65118303), we get a palindrome (95499459).

The spelling of 30381156 in words is "thirty million, three hundred eighty-one thousand, one hundred fifty-six".