30986040 has 64 divisors (see below), whose sum is σ = 93636000. Its totient is φ = 8202752.

The previous prime is 30986027. The next prime is 30986047. The reversal of 30986040 is 4068903.

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

It is a junction number, because it is equal to n+sod(n) for n = 30985989 and 30986007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30986047) 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, 17014 + ... + 18746.

Almost surely, 2^30986040 is an apocalyptic number.

30986040 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 30986040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46818000).

30986040 is an abundant number, since it is smaller than the sum of its proper divisors (62649960).

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

30986040 is a wasteful number, since it uses less digits than its factorization.

30986040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896 (or 1892 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 30986040 is about 5566.5105766539. The cubic root of 30986040 is about 314.0909036711.

The spelling of 30986040 in words is "thirty million, nine hundred eighty-six thousand, forty".