30861000 has 192 divisors, whose sum is σ = 109025280. Its totient is φ = 8164800.

The previous prime is 30860993. The next prime is 30861007. The reversal of 30861000 is 16803.

It is an interprime number because it is at equal distance from previous prime (30860993) and next prime (30861007).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30861007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 242937 + ... + 243063.

It is an arithmetic number, because the mean of its divisors is an integer number (567840).

Almost surely, 2^30861000 is an apocalyptic number.

30861000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30861000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54512640).

30861000 is an abundant number, since it is smaller than the sum of its proper divisors (78164280).

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

30861000 is a wasteful number, since it uses less digits than its factorization.

30861000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 30861000 is about 5555.2677703239. The cubic root of 30861000 is about 313.6678435493.

Adding to 30861000 its reverse (16803), we get a palindrome (30877803).

The spelling of 30861000 in words is "thirty million, eight hundred sixty-one thousand".