30209940 has 72 divisors (see below), whose sum is σ = 92306760. Its totient is φ = 7997184.

The previous prime is 30209939. The next prime is 30209983. The reversal of 30209940 is 4990203.

It can be written as a sum of positive squares in 4 ways, for example, as 1179396 + 29030544 = 1086^2 + 5388^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27726 + ... + 28794.

Almost surely, 2^30209940 is an apocalyptic number.

30209940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30209940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46153380).

30209940 is an abundant number, since it is smaller than the sum of its proper divisors (62096820).

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

30209940 is a wasteful number, since it uses less digits than its factorization.

30209940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1236 counting only the distinct ones).

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

The square root of 30209940 is about 5496.3569753065. The cubic root of 30209940 is about 311.4463801584.

The spelling of 30209940 in words is "thirty million, two hundred nine thousand, nine hundred forty".