30639397 has 4 divisors (see below), whose sum is σ = 30748716. Its totient is φ = 30530080.

The previous prime is 30639383. The next prime is 30639421. The reversal of 30639397 is 79393603.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9054081 + 21585316 = 3009^2 + 4646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30639397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30639097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54238 + ... + 54799.

It is an arithmetic number, because the mean of its divisors is an integer number (7687179).

Almost surely, 2^30639397 is an apocalyptic number.

It is an amenable number.

30639397 is a deficient number, since it is larger than the sum of its proper divisors (109319).

30639397 is a wasteful number, since it uses less digits than its factorization.

30639397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109318.

The product of its (nonzero) digits is 91854, while the sum is 40.

The square root of 30639397 is about 5535.2865327822. The cubic root of 30639397 is about 312.9152563811.

The spelling of 30639397 in words is "thirty million, six hundred thirty-nine thousand, three hundred ninety-seven".