30231540 has 36 divisors (see below), whose sum is σ = 91702884. Its totient is φ = 8061696.

The previous prime is 30231533. The next prime is 30231547. The reversal of 30231540 is 4513203.

It is an interprime number because it is at equal distance from previous prime (30231533) and next prime (30231547).

It can be written as a sum of positive squares in 2 ways, for example, as 21123216 + 9108324 = 4596^2 + 3018^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30231547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83797 + ... + 84156.

Almost surely, 2^30231540 is an apocalyptic number.

30231540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30231540 is an abundant number, since it is smaller than the sum of its proper divisors (61471344).

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

30231540 is a wasteful number, since it uses less digits than its factorization.

30231540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167968 (or 167963 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 30231540 is about 5498.3215620769. The cubic root of 30231540 is about 311.5205901605.

Adding to 30231540 its reverse (4513203), we get a palindrome (34744743).

The spelling of 30231540 in words is "thirty million, two hundred thirty-one thousand, five hundred forty".