30638942 has 4 divisors (see below), whose sum is σ = 45958416. Its totient is φ = 15319470.

The previous prime is 30638941. The next prime is 30638953. The reversal of 30638942 is 24983603.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30638941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7659734 + ... + 7659737.

It is an arithmetic number, because the mean of its divisors is an integer number (11489604).

Almost surely, 2^30638942 is an apocalyptic number.

30638942 is a deficient number, since it is larger than the sum of its proper divisors (15319474).

30638942 is a wasteful number, since it uses less digits than its factorization.

30638942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15319473.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 30638942 is about 5535.2454326796. The cubic root of 30638942 is about 312.9137074260.

The spelling of 30638942 in words is "thirty million, six hundred thirty-eight thousand, nine hundred forty-two".