30806940 has 48 divisors (see below), whose sum is σ = 88597152. Its totient is φ = 7992576.

The previous prime is 30806933. The next prime is 30806953. The reversal of 30806940 is 4960803.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 30806898 and 30806907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4719 + ... + 9158.

It is an arithmetic number, because the mean of its divisors is an integer number (1845774).

Almost surely, 2^30806940 is an apocalyptic number.

30806940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30806940 is an abundant number, since it is smaller than the sum of its proper divisors (57790212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30806940 is a wasteful number, since it uses less digits than its factorization.

30806940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13926 (or 13924 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 30806940 is about 5550.3999855866. The cubic root of 30806940 is about 313.4845831825.

The spelling of 30806940 in words is "thirty million, eight hundred six thousand, nine hundred forty".