30947742 has 96 divisors (see below), whose sum is σ = 81768960. Its totient is φ = 8268480.

The previous prime is 30947737. The next prime is 30947773. The reversal of 30947742 is 24774903.

It is a junction number, because it is equal to n+sod(n) for n = 30947697 and 30947706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170892 + ... + 171072.

It is an arithmetic number, because the mean of its divisors is an integer number (851760).

Almost surely, 2^30947742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30947742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40884480).

30947742 is an abundant number, since it is smaller than the sum of its proper divisors (50821218).

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

30947742 is a wasteful number, since it uses less digits than its factorization.

30947742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 30947742 is about 5563.0694764671. The cubic root of 30947742 is about 313.9614473879.

The spelling of 30947742 in words is "thirty million, nine hundred forty-seven thousand, seven hundred forty-two".