30311442 has 128 divisors (see below), whose sum is σ = 83980800. Its totient is φ = 7907328.

The previous prime is 30311429. The next prime is 30311453. The reversal of 30311442 is 24411303.

It is a super-2 number, since 2×30311442² = 1837567032238728, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 340534 + ... + 340622.

It is an arithmetic number, because the mean of its divisors is an integer number (656100).

Almost surely, 2^30311442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30311442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41990400).

30311442 is an abundant number, since it is smaller than the sum of its proper divisors (53669358).

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

30311442 is a wasteful number, since it uses less digits than its factorization.

30311442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 30311442 is about 5505.5828029374. The cubic root of 30311442 is about 311.7947985011.

Adding to 30311442 its reverse (24411303), we get a palindrome (54722745).

The spelling of 30311442 in words is "thirty million, three hundred eleven thousand, four hundred forty-two".