30499840 has 176 divisors, whose sum is σ = 89609472. Its totient is φ = 9732096.

The previous prime is 30499829. The next prime is 30499841. The reversal of 30499840 is 4899403.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 30499840.

It is not an unprimeable number, because it can be changed into a prime (30499841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 824302 + ... + 824338.

Almost surely, 2^30499840 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 30499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44804736).

30499840 is an abundant number, since it is smaller than the sum of its proper divisors (59109632).

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

30499840 is a wasteful number, since it uses less digits than its factorization.

30499840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 30499840 is about 5522.6660228553. Note that the first 3 decimals coincide. The cubic root of 30499840 is about 312.4394421322.

The spelling of 30499840 in words is "thirty million, four hundred ninety-nine thousand, eight hundred forty".