30491900 has 36 divisors (see below), whose sum is σ = 66844680. Its totient is φ = 12072000.

The previous prime is 30491899. The next prime is 30491911. The reversal of 30491900 is 919403.

It is a happy number.

It is a super-2 number, since 2×30491900² = 1859511931220000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30491900.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8591 + ... + 11609.

Almost surely, 2^30491900 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 30491900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33422340).

30491900 is an abundant number, since it is smaller than the sum of its proper divisors (36352780).

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

30491900 is a wasteful number, since it uses less digits than its factorization.

30491900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 30491900 is about 5521.9471203553. The cubic root of 30491900 is about 312.4123274056.

The spelling of 30491900 in words is "thirty million, four hundred ninety-one thousand, nine hundred".