30187138 has 16 divisors (see below), whose sum is σ = 48328704. Its totient is φ = 14091840.

The previous prime is 30187133. The next prime is 30187147. The reversal of 30187138 is 83178103.

It is a super-2 number, since 2×30187138² = 1822526601262088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30187133) 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, 823 + ... + 7813.

It is an arithmetic number, because the mean of its divisors is an integer number (3020544).

Almost surely, 2^30187138 is an apocalyptic number.

30187138 is a deficient number, since it is larger than the sum of its proper divisors (18141566).

30187138 is a wasteful number, since it uses less digits than its factorization.

30187138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 30187138 is about 5494.2823007195. The cubic root of 30187138 is about 311.3680021165.

The spelling of 30187138 in words is "thirty million, one hundred eighty-seven thousand, one hundred thirty-eight".