30139793 has 8 divisors (see below), whose sum is σ = 32775912. Its totient is φ = 27599616.

The previous prime is 30139777. The next prime is 30139799. The reversal of 30139793 is 39793103.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8162449 + 21977344 = 2857^2 + 4688^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30139793 - 2⁴ = 30139777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30139799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23330 + ... + 24587.

It is an arithmetic number, because the mean of its divisors is an integer number (4096989).

Almost surely, 2^30139793 is an apocalyptic number.

It is an amenable number.

30139793 is a deficient number, since it is larger than the sum of its proper divisors (2636119).

30139793 is a wasteful number, since it uses less digits than its factorization.

30139793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47971.

The product of its (nonzero) digits is 15309, while the sum is 35.

The square root of 30139793 is about 5489.9720400017. The cubic root of 30139793 is about 311.2051354935.

The spelling of 30139793 in words is "thirty million, one hundred thirty-nine thousand, seven hundred ninety-three".