30381645 has 16 divisors (see below), whose sum is σ = 55555200. Its totient is φ = 13888704.

The previous prime is 30381629. The next prime is 30381649. The reversal of 30381645 is 54618303.

It is not a de Polignac number, because 30381645 - 2⁴ = 30381629 is a prime.

It is a super-3 number, since 3×30381645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30381649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144570 + ... + 144779.

It is an arithmetic number, because the mean of its divisors is an integer number (3472200).

Almost surely, 2^30381645 is an apocalyptic number.

30381645 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30381645 is a deficient number, since it is larger than the sum of its proper divisors (25173555).

30381645 is a wasteful number, since it uses less digits than its factorization.

30381645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289364.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 30381645 is about 5511.9547349375. The cubic root of 30381645 is about 312.0353243206.

Adding to 30381645 its reverse (54618303), we get a palindrome (84999948).

The spelling of 30381645 in words is "thirty million, three hundred eighty-one thousand, six hundred forty-five".