30138861 has 8 divisors (see below), whose sum is σ = 40751424. Its totient is φ = 19809440.

The previous prime is 30138839. The next prime is 30138887. The reversal of 30138861 is 16883103.

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

It is a cyclic number.

It is not a de Polignac number, because 30138861 - 2¹⁰ = 30137837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30138061) 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, 70536 + ... + 70961.

It is an arithmetic number, because the mean of its divisors is an integer number (5093928).

Almost surely, 2^30138861 is an apocalyptic number.

It is an amenable number.

30138861 is a deficient number, since it is larger than the sum of its proper divisors (10612563).

30138861 is a wasteful number, since it uses less digits than its factorization.

30138861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141571.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 30138861 is about 5489.8871573102. The cubic root of 30138861 is about 311.2019277057.

The spelling of 30138861 in words is "thirty million, one hundred thirty-eight thousand, eight hundred sixty-one".