30349781 has 8 divisors (see below), whose sum is σ = 37838784. Its totient is φ = 23649120.

The previous prime is 30349763. The next prime is 30349789. The reversal of 30349781 is 18794303.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-30349781 is a prime.

It is a super-2 number, since 2×30349781² = 1842218413495922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30349789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197000 + ... + 197153.

It is an arithmetic number, because the mean of its divisors is an integer number (4729848).

Almost surely, 2^30349781 is an apocalyptic number.

It is an amenable number.

30349781 is a deficient number, since it is larger than the sum of its proper divisors (7489003).

30349781 is a wasteful number, since it uses less digits than its factorization.

30349781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394171.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 30349781 is about 5509.0635320352. The cubic root of 30349781 is about 311.9261995345.

The spelling of 30349781 in words is "thirty million, three hundred forty-nine thousand, seven hundred eighty-one".