30987420 has 24 divisors (see below), whose sum is σ = 86764944. Its totient is φ = 8263296.

The previous prime is 30987377. The next prime is 30987421. The reversal of 30987420 is 2478903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30987421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 258169 + ... + 258288.

It is an arithmetic number, because the mean of its divisors is an integer number (3615206).

Almost surely, 2^30987420 is an apocalyptic number.

30987420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30987420 is an abundant number, since it is smaller than the sum of its proper divisors (55777524).

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

30987420 is a wasteful number, since it uses less digits than its factorization.

30987420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516469 (or 516467 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 30987420 is about 5566.6345308454. The cubic root of 30987420 is about 314.0955664053.

The spelling of 30987420 in words is "thirty million, nine hundred eighty-seven thousand, four hundred twenty".