30123438 has 16 divisors (see below), whose sum is σ = 61716816. Its totient is φ = 9796160.

The previous prime is 30123437. The next prime is 30123461. The reversal of 30123438 is 83432103.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123437) 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, 60981 + ... + 61472.

It is an arithmetic number, because the mean of its divisors is an integer number (3857301).

Almost surely, 2^30123438 is an apocalyptic number.

30123438 is an abundant number, since it is smaller than the sum of its proper divisors (31593378).

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

30123438 is a wasteful number, since it uses less digits than its factorization.

30123438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122499.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 30123438 is about 5488.4823038796. The cubic root of 30123438 is about 311.1488347208.

The spelling of 30123438 in words is "thirty million, one hundred twenty-three thousand, four hundred thirty-eight".