30993400 has 48 divisors (see below), whose sum is σ = 72428400. Its totient is φ = 12334080.

The previous prime is 30993353. The next prime is 30993401. The reversal of 30993400 is 439903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30993401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70381 + ... + 70819.

It is an arithmetic number, because the mean of its divisors is an integer number (1508925).

Almost surely, 2^30993400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30993400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36214200).

30993400 is an abundant number, since it is smaller than the sum of its proper divisors (41435000).

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

30993400 is a wasteful number, since it uses less digits than its factorization.

30993400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 30993400 is about 5567.1716337832. The cubic root of 30993400 is about 314.1157699877.

The spelling of 30993400 in words is "thirty million, nine hundred ninety-three thousand, four hundred".