30139638 has 16 divisors (see below), whose sum is σ = 60410880. Its totient is φ = 10024616.

The previous prime is 30139631. The next prime is 30139639. The reversal of 30139638 is 83693103.

It is a junction number, because it is equal to n+sod(n) for n = 30139599 and 30139608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30139631) 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, 2370 + ... + 8117.

It is an arithmetic number, because the mean of its divisors is an integer number (3775680).

Almost surely, 2^30139638 is an apocalyptic number.

30139638 is an abundant number, since it is smaller than the sum of its proper divisors (30271242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30139638 is a wasteful number, since it uses less digits than its factorization.

30139638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10971.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 30139638 is about 5489.9579233360. The cubic root of 30139638 is about 311.2046020141.

The spelling of 30139638 in words is "thirty million, one hundred thirty-nine thousand, six hundred thirty-eight".