30649947 has 4 divisors (see below), whose sum is σ = 40866600. Its totient is φ = 20433296.

The previous prime is 30649943. The next prime is 30649951. The reversal of 30649947 is 74994603.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (30649943) and next prime (30649951).

It is a cyclic number.

It is not a de Polignac number, because 30649947 - 2² = 30649943 is a prime.

It is a super-2 number, since 2×30649947² = 1878838502205618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30649899 and 30649908.

It is not an unprimeable number, because it can be changed into a prime (30649943) 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, 5108322 + ... + 5108327.

It is an arithmetic number, because the mean of its divisors is an integer number (10216650).

Almost surely, 2^30649947 is an apocalyptic number.

30649947 is a deficient number, since it is larger than the sum of its proper divisors (10216653).

30649947 is a wasteful number, since it uses less digits than its factorization.

30649947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10216652.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 30649947 is about 5536.2394276259. The cubic root of 30649947 is about 312.9511674134.

The spelling of 30649947 in words is "thirty million, six hundred forty-nine thousand, nine hundred forty-seven".