30709940 has 12 divisors (see below), whose sum is σ = 64490916. Its totient is φ = 12283968.

The previous prime is 30709883. The next prime is 30709969. The reversal of 30709940 is 4990703.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13454224 + 17255716 = 3668^2 + 4154^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30709897 and 30709906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767729 + ... + 767768.

It is an arithmetic number, because the mean of its divisors is an integer number (5374243).

Almost surely, 2^30709940 is an apocalyptic number.

It is an amenable number.

30709940 is an abundant number, since it is smaller than the sum of its proper divisors (33780976).

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

30709940 is a wasteful number, since it uses less digits than its factorization.

30709940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535506 (or 1535504 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 30709940 is about 5541.6549874564. The cubic root of 30709940 is about 313.1552204356.

The spelling of 30709940 in words is "thirty million, seven hundred nine thousand, nine hundred forty".