30140638 has 16 divisors (see below), whose sum is σ = 49466736. Its totient is φ = 13659840.

The previous prime is 30140629. The next prime is 30140639. The reversal of 30140638 is 83604103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30140639) 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, 6370 + ... + 10042.

It is an arithmetic number, because the mean of its divisors is an integer number (3091671).

Almost surely, 2^30140638 is an apocalyptic number.

30140638 is a deficient number, since it is larger than the sum of its proper divisors (19326098).

30140638 is a wasteful number, since it uses less digits than its factorization.

30140638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 30140638 is about 5490.0489979599. The cubic root of 30140638 is about 311.2080437847.

The spelling of 30140638 in words is "thirty million, one hundred forty thousand, six hundred thirty-eight".