30999240 has 64 divisors (see below), whose sum is σ = 103334400. Its totient is φ = 8266176.

The previous prime is 30999217. The next prime is 30999247. The reversal of 30999240 is 4299903.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 30999195 and 30999204.

It is not an unprimeable number, because it can be changed into a prime (30999247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13272 + ... + 15431.

It is an arithmetic number, because the mean of its divisors is an integer number (1614600).

Almost surely, 2^30999240 is an apocalyptic number.

30999240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30999240 is an abundant number, since it is smaller than the sum of its proper divisors (72335160).

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

30999240 is a wasteful number, since it uses less digits than its factorization.

30999240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28723 (or 28713 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 30999240 is about 5567.6961123969. The cubic root of 30999240 is about 314.1354980684.

The spelling of 30999240 in words is "thirty million, nine hundred ninety-nine thousand, two hundred forty".