30138849 has 24 divisors (see below), whose sum is σ = 47185320. Its totient is φ = 18427392.

The previous prime is 30138839. The next prime is 30138887. The reversal of 30138849 is 94883103.

It can be written as a sum of positive squares in 4 ways, for example, as 2387025 + 27751824 = 1545^2 + 5268^2 .

It is not a de Polignac number, because 30138849 - 2⁵ = 30138817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30138839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19497 + ... + 20985.

It is an arithmetic number, because the mean of its divisors is an integer number (1966055).

Almost surely, 2^30138849 is an apocalyptic number.

30138849 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

30138849 is a deficient number, since it is larger than the sum of its proper divisors (17046471).

30138849 is a wasteful number, since it uses less digits than its factorization.

30138849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 30138849 is about 5489.8860643915. The cubic root of 30138849 is about 311.2018864033.

The spelling of 30138849 in words is "thirty million, one hundred thirty-eight thousand, eight hundred forty-nine".