30138449 has 4 divisors (see below), whose sum is σ = 32878320. Its totient is φ = 27398580.

The previous prime is 30138413. The next prime is 30138469. The reversal of 30138449 is 94483103.

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.

It is not a de Polignac number, because 30138449 - 2⁸ = 30138193 is a prime.

It is a super-2 number, since 2×30138449² = 1816652216251202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30138469) 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, 1369919 + ... + 1369940.

It is an arithmetic number, because the mean of its divisors is an integer number (8219580).

Almost surely, 2^30138449 is an apocalyptic number.

It is an amenable number.

30138449 is a deficient number, since it is larger than the sum of its proper divisors (2739871).

30138449 is a wasteful number, since it uses less digits than its factorization.

30138449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739870.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 30138449 is about 5489.8496336421. The cubic root of 30138449 is about 311.2005096497.

The spelling of 30138449 in words is "thirty million, one hundred thirty-eight thousand, four hundred forty-nine".