30909457 has 4 divisors (see below), whose sum is σ = 31193140. Its totient is φ = 30625776.

The previous prime is 30909421. The next prime is 30909469. The reversal of 30909457 is 75490903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75490903 = 3607 ⋅20929.

It can be written as a sum of positive squares in 2 ways, for example, as 12453841 + 18455616 = 3529^2 + 4296^2 .

It is a cyclic number.

It is not a de Polignac number, because 30909457 - 2¹⁵ = 30876689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30909407) 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, 141678 + ... + 141895.

It is an arithmetic number, because the mean of its divisors is an integer number (7798285).

Almost surely, 2^30909457 is an apocalyptic number.

It is an amenable number.

30909457 is a deficient number, since it is larger than the sum of its proper divisors (283683).

30909457 is a wasteful number, since it uses less digits than its factorization.

30909457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283682.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 30909457 is about 5559.6274155738. The cubic root of 30909457 is about 313.8319282561.

The spelling of 30909457 in words is "thirty million, nine hundred nine thousand, four hundred fifty-seven".