30520406 has 16 divisors (see below), whose sum is σ = 55398816. Its totient is φ = 12310656.

The previous prime is 30520393. The next prime is 30520429. The reversal of 30520406 is 60402503.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63881 + ... + 64356.

It is an arithmetic number, because the mean of its divisors is an integer number (3462426).

Almost surely, 2^30520406 is an apocalyptic number.

30520406 is a deficient number, since it is larger than the sum of its proper divisors (24878410).

30520406 is a wasteful number, since it uses less digits than its factorization.

30520406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128263.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 30520406 is about 5524.5276721182. The cubic root of 30520406 is about 312.5096521819.

Adding to 30520406 its reverse (60402503), we get a palindrome (90922909).

The spelling of 30520406 in words is "thirty million, five hundred twenty thousand, four hundred six".