30905949 has 24 divisors (see below), whose sum is σ = 44846560. Its totient is φ = 18918144.

The previous prime is 30905947. The next prime is 30905957. The reversal of 30905949 is 94950903.

It is a happy number.

It is not a de Polignac number, because 30905949 - 2¹ = 30905947 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 (30905947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36867 + ... + 37695.

Almost surely, 2^30905949 is an apocalyptic number.

It is an amenable number.

30905949 is a deficient number, since it is larger than the sum of its proper divisors (13940611).

30905949 is a wasteful number, since it uses less digits than its factorization.

30905949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 30905949 is about 5559.3119178546. The cubic root of 30905949 is about 313.8200552550.

The spelling of 30905949 in words is "thirty million, nine hundred five thousand, nine hundred forty-nine".