30121993 has 8 divisors (see below), whose sum is σ = 32963616. Its totient is φ = 27297600.

The previous prime is 30121991. The next prime is 30121997. The reversal of 30121993 is 39912103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30121993 - 2¹ = 30121991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496 + ... + 7777.

It is an arithmetic number, because the mean of its divisors is an integer number (4120452).

Almost surely, 2^30121993 is an apocalyptic number.

It is an amenable number.

30121993 is a deficient number, since it is larger than the sum of its proper divisors (2841623).

30121993 is a wasteful number, since it uses less digits than its factorization.

30121993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8615.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 30121993 is about 5488.3506629952. The cubic root of 30121993 is about 311.1438594448.

It can be divided in two parts, 3012 and 1993, that added together give a palindrome (5005).

The spelling of 30121993 in words is "thirty million, one hundred twenty-one thousand, nine hundred ninety-three".