30983989 has 4 divisors (see below), whose sum is σ = 31220640. Its totient is φ = 30747340.

The previous prime is 30983971. The next prime is 30983999. The reversal of 30983989 is 98938903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98938903 = 7 ⋅14134129.

It is a cyclic number.

It is not a de Polignac number, because 30983989 - 2⁵ = 30983957 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 (30983969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118129 + ... + 118390.

It is an arithmetic number, because the mean of its divisors is an integer number (7805160).

Almost surely, 2^30983989 is an apocalyptic number.

It is an amenable number.

30983989 is a deficient number, since it is larger than the sum of its proper divisors (236651).

30983989 is a wasteful number, since it uses less digits than its factorization.

30983989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236650.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 30983989 is about 5566.3263468827. The cubic root of 30983989 is about 314.0839735109.

The spelling of 30983989 in words is "thirty million, nine hundred eighty-three thousand, nine hundred eighty-nine".