30399949 has 4 divisors (see below), whose sum is σ = 30411036. Its totient is φ = 30388864.

The previous prime is 30399947. The next prime is 30399973. The reversal of 30399949 is 94999303.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94999303 = 7 ⋅13571329.

It can be written as a sum of positive squares in 2 ways, for example, as 18275625 + 12124324 = 4275^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 30399949 - 2¹ = 30399947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30399899 and 30399908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30399947) 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, 1917 + ... + 8029.

It is an arithmetic number, because the mean of its divisors is an integer number (7602759).

Almost surely, 2^30399949 is an apocalyptic number.

It is an amenable number.

30399949 is a deficient number, since it is larger than the sum of its proper divisors (11087).

30399949 is an equidigital number, since it uses as much as digits as its factorization.

30399949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11086.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 30399949 is about 5513.6148759231. The cubic root of 30399949 is about 312.0979756129.

The spelling of 30399949 in words is "thirty million, three hundred ninety-nine thousand, nine hundred forty-nine".