30909420 has 36 divisors (see below), whose sum is σ = 93759120. Its totient is φ = 8242464.

The previous prime is 30909413. The next prime is 30909421. The reversal of 30909420 is 2490903.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30909421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85680 + ... + 86039.

It is an arithmetic number, because the mean of its divisors is an integer number (2604420).

Almost surely, 2^30909420 is an apocalyptic number.

30909420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30909420 is an abundant number, since it is smaller than the sum of its proper divisors (62849700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30909420 is a wasteful number, since it uses less digits than its factorization.

30909420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171734 (or 171729 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 30909420 is about 5559.6240880117. The cubic root of 30909420 is about 313.8318030325.

It can be divided in two parts, 30909 and 420, that added together give a square (31329 = 177²).

The spelling of 30909420 in words is "thirty million, nine hundred nine thousand, four hundred twenty".