30684397 has 4 divisors (see below), whose sum is σ = 30818620. Its totient is φ = 30550176.

The previous prime is 30684383. The next prime is 30684419. The reversal of 30684397 is 79348603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79348603 = 7703 ⋅10301.

It can be written as a sum of positive squares in 2 ways, for example, as 22005481 + 8678916 = 4691^2 + 2946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30684397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30684317) 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, 66768 + ... + 67225.

It is an arithmetic number, because the mean of its divisors is an integer number (7704655).

Almost surely, 2^30684397 is an apocalyptic number.

It is an amenable number.

30684397 is a deficient number, since it is larger than the sum of its proper divisors (134223).

30684397 is a wasteful number, since it uses less digits than its factorization.

30684397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134222.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 30684397 is about 5539.3498716005. The cubic root of 30684397 is about 313.0683740430.

The spelling of 30684397 in words is "thirty million, six hundred eighty-four thousand, three hundred ninety-seven".