30749879 has 2 divisors, whose sum is σ = 30749880. Its totient is φ = 30749878.

The previous prime is 30749869. The next prime is 30749897. The reversal of 30749879 is 97894703.

Together with next prime (30749897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30749879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30749819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15374939 + 15374940.

It is an arithmetic number, because the mean of its divisors is an integer number (15374940).

Almost surely, 2^30749879 is an apocalyptic number.

30749879 is a deficient number, since it is larger than the sum of its proper divisors (1).

30749879 is an equidigital number, since it uses as much as digits as its factorization.

30749879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 30749879 is about 5545.2573429914. The cubic root of 30749879 is about 313.2909168728.

The spelling of 30749879 in words is "thirty million, seven hundred forty-nine thousand, eight hundred seventy-nine".