30423900 has 144 divisors (see below), whose sum is σ = 98431200. Its totient is φ = 7203840.

The previous prime is 30423889. The next prime is 30423901. The reversal of 30423900 is 932403.

30423900 is a nontrivial binomial coefficient, being equal to C(7801, 2).

It is a super-2 number, since 2×30423900² = 1851227382420000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30423901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112966 + ... + 113234.

It is an arithmetic number, because the mean of its divisors is an integer number (683550).

Almost surely, 2^30423900 is an apocalyptic number.

30423900 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30423900 is the 7800-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30423900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49215600).

30423900 is an abundant number, since it is smaller than the sum of its proper divisors (68007300).

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

30423900 is a wasteful number, since it uses less digits than its factorization.

30423900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 30423900 is about 5515.7864353146. The cubic root of 30423900 is about 312.1799175965.

The spelling of 30423900 in words is "thirty million, four hundred twenty-three thousand, nine hundred".