30405042 has 48 divisors (see below), whose sum is σ = 68104608. Its totient is φ = 9797760.

The previous prime is 30405031. The next prime is 30405047. The reversal of 30405042 is 24050403.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (30405047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126042 + ... + 126282.

It is an arithmetic number, because the mean of its divisors is an integer number (1418846).

Almost surely, 2^30405042 is an apocalyptic number.

30405042 is an abundant number, since it is smaller than the sum of its proper divisors (37699566).

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

30405042 is a wasteful number, since it uses less digits than its factorization.

30405042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 30405042 is about 5514.0767132857. The cubic root of 30405042 is about 312.1154035614.

Adding to 30405042 its reverse (24050403), we get a palindrome (54455445).

The spelling of 30405042 in words is "thirty million, four hundred five thousand, forty-two".