30420845 has 48 divisors (see below), whose sum is σ = 46730880. Its totient is φ = 18600192.

The previous prime is 30420829. The next prime is 30420857. The reversal of 30420845 is 54802403.

It is not a de Polignac number, because 30420845 - 2⁴ = 30420829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218786 + ... + 218924.

It is an arithmetic number, because the mean of its divisors is an integer number (973560).

Almost surely, 2^30420845 is an apocalyptic number.

30420845 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30420845 is a deficient number, since it is larger than the sum of its proper divisors (16310035).

30420845 is a wasteful number, since it uses less digits than its factorization.

30420845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 30420845 is about 5515.5094959577. The cubic root of 30420845 is about 312.1694681190.

It can be divided in two parts, 30420 and 845, that multiplied together give a square (25704900 = 5070²).

The spelling of 30420845 in words is "thirty million, four hundred twenty thousand, eight hundred forty-five".