30474721 has 4 divisors (see below), whose sum is σ = 30493444. Its totient is φ = 30456000.

The previous prime is 30474683. The next prime is 30474751. The reversal of 30474721 is 12747403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12747403 = 2423 ⋅5261.

It can be written as a sum of positive squares in 2 ways, for example, as 12327121 + 18147600 = 3511^2 + 4260^2 .

It is a cyclic number.

It is not a de Polignac number, because 30474721 - 2⁷ = 30474593 is a prime.

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 30474721.

It is not an unprimeable number, because it can be changed into a prime (30474751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660 + ... + 10261.

It is an arithmetic number, because the mean of its divisors is an integer number (7623361).

Almost surely, 2^30474721 is an apocalyptic number.

It is an amenable number.

30474721 is a deficient number, since it is larger than the sum of its proper divisors (18723).

30474721 is a wasteful number, since it uses less digits than its factorization.

30474721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18722.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 30474721 is about 5520.3913810526. The cubic root of 30474721 is about 312.3536458148.

The spelling of 30474721 in words is "thirty million, four hundred seventy-four thousand, seven hundred twenty-one".