30987391 has 6 divisors (see below), whose sum is σ = 31726680. Its totient is φ = 30264948.

The previous prime is 30987377. The next prime is 30987421. The reversal of 30987391 is 19378903.

It is not a de Polignac number, because 30987391 - 2⁷ = 30987263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30987301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6531 + ... + 10228.

It is an arithmetic number, because the mean of its divisors is an integer number (5287780).

Almost surely, 2^30987391 is an apocalyptic number.

30987391 is a deficient number, since it is larger than the sum of its proper divisors (739289).

30987391 is an equidigital number, since it uses as much as digits as its factorization.

30987391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16845 (or 16802 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 30987391 is about 5566.6319260393. The cubic root of 30987391 is about 314.0954684218.

The spelling of 30987391 in words is "thirty million, nine hundred eighty-seven thousand, three hundred ninety-one".