30420975 has 48 divisors (see below), whose sum is σ = 55558944. Its totient is φ = 14592000.

The previous prime is 30420961. The next prime is 30420977. The reversal of 30420975 is 57902403.

It is not a de Polignac number, because 30420975 - 2¹⁵ = 30388207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30420977) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39595 + ... + 40355.

It is an arithmetic number, because the mean of its divisors is an integer number (1157478).

Almost surely, 2^30420975 is an apocalyptic number.

30420975 is a deficient number, since it is larger than the sum of its proper divisors (25137969).

30420975 is a wasteful number, since it uses less digits than its factorization.

30420975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 30420975 is about 5515.5212808945. The cubic root of 30420975 is about 312.1699127919.

The spelling of 30420975 in words is "thirty million, four hundred twenty thousand, nine hundred seventy-five".