30842639 has 2 divisors, whose sum is σ = 30842640. Its totient is φ = 30842638.

The previous prime is 30842633. The next prime is 30842657. The reversal of 30842639 is 93624803.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30842639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30842599 and 30842608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30842633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15421319 + 15421320.

It is an arithmetic number, because the mean of its divisors is an integer number (15421320).

Almost surely, 2^30842639 is an apocalyptic number.

30842639 is a deficient number, since it is larger than the sum of its proper divisors (1).

30842639 is an equidigital number, since it uses as much as digits as its factorization.

30842639 is an evil number, because the sum of its binary digits is even.

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

The square root of 30842639 is about 5553.6149488419. The cubic root of 30842639 is about 313.6056248069.

The spelling of 30842639 in words is "thirty million, eight hundred forty-two thousand, six hundred thirty-nine".