30102138 has 96 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 8553600.

The previous prime is 30102131. The next prime is 30102139. The reversal of 30102138 is 83120103.

It is a super-2 number, since 2×30102138² = 1812277424342088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 30102138.

It is not an unprimeable number, because it can be changed into a prime (30102131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110943 + ... + 111213.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^30102138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30102138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39070080).

30102138 is an abundant number, since it is smaller than the sum of its proper divisors (48038022).

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

30102138 is a wasteful number, since it uses less digits than its factorization.

30102138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 30102138 is about 5486.5415336075. The cubic root of 30102138 is about 311.0754806228.

The spelling of 30102138 in words is "thirty million, one hundred two thousand, one hundred thirty-eight".