30211947 has 14 divisors (see below), whose sum is σ = 45298292. Its totient is φ = 20140812.

The previous prime is 30211933. The next prime is 30211963. The reversal of 30211947 is 74911203.

It is not a de Polignac number, because 30211947 - 2⁴ = 30211931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30211947.

It is not an unprimeable number, because it can be changed into a prime (30211927) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 19993 + ... + 21450.

Almost surely, 2^30211947 is an apocalyptic number.

30211947 is a deficient number, since it is larger than the sum of its proper divisors (15086345).

30211947 is an frugal number, since it uses more digits than its factorization.

30211947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41461 (or 41446 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 30211947 is about 5496.5395477518. The cubic root of 30211947 is about 311.4532769949.

The spelling of 30211947 in words is "thirty million, two hundred eleven thousand, nine hundred forty-seven".