30840249 has 32 divisors (see below), whose sum is σ = 47784960. Its totient is φ = 17496000.

The previous prime is 30840247. The next prime is 30840259. The reversal of 30840249 is 94204803.

It is a happy number.

It is not a de Polignac number, because 30840249 - 2¹ = 30840247 is a prime.

It is a super-2 number, since 2×30840249² = 1902241916764002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30840247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63084 + ... + 63570.

It is an arithmetic number, because the mean of its divisors is an integer number (1493280).

Almost surely, 2^30840249 is an apocalyptic number.

It is an amenable number.

30840249 is a deficient number, since it is larger than the sum of its proper divisors (16944711).

30840249 is a wasteful number, since it uses less digits than its factorization.

30840249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 30840249 is about 5553.3997695106. The cubic root of 30840249 is about 313.5975241512.

The spelling of 30840249 in words is "thirty million, eight hundred forty thousand, two hundred forty-nine".