30449820 has 24 divisors (see below), whose sum is σ = 85259664. Its totient is φ = 8119936.

The previous prime is 30449791. The next prime is 30449821. The reversal of 30449820 is 2894403.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30449821) 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, 253689 + ... + 253808.

It is an arithmetic number, because the mean of its divisors is an integer number (3552486).

Almost surely, 2^30449820 is an apocalyptic number.

30449820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30449820 is an abundant number, since it is smaller than the sum of its proper divisors (54809844).

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

30449820 is a wasteful number, since it uses less digits than its factorization.

30449820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507509 (or 507507 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 30449820 is about 5518.1355546960. The cubic root of 30449820 is about 312.2685475509.

The spelling of 30449820 in words is "thirty million, four hundred forty-nine thousand, eight hundred twenty".