30639742 has 32 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 12361248.

The previous prime is 30639709. The next prime is 30639743. The reversal of 30639742 is 24793603.

It is a junction number, because it is equal to n+sod(n) for n = 30639698 and 30639707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30639743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60663 + ... + 61165.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^30639742 is an apocalyptic number.

30639742 is a deficient number, since it is larger than the sum of its proper divisors (25001858).

30639742 is a wasteful number, since it uses less digits than its factorization.

30639742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 30639742 is about 5535.3176963929. The cubic root of 30639742 is about 312.9164308533.

The spelling of 30639742 in words is "thirty million, six hundred thirty-nine thousand, seven hundred forty-two".