32405540 has 24 divisors (see below), whose sum is σ = 70248192. Its totient is φ = 12543840.

The previous prime is 32405537. The next prime is 32405543. The reversal of 32405540 is 4550423.

It is an interprime number because it is at equal distance from previous prime (32405537) and next prime (32405543).

It is not an unprimeable number, because it can be changed into a prime (32405543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25514 + ... + 26753.

It is an arithmetic number, because the mean of its divisors is an integer number (2927008).

Almost surely, 2^32405540 is an apocalyptic number.

It is an amenable number.

32405540 is an abundant number, since it is smaller than the sum of its proper divisors (37842652).

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

32405540 is a wasteful number, since it uses less digits than its factorization.

32405540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52307 (or 52305 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 32405540 is about 5692.5864068980. The cubic root of 32405540 is about 318.8157398689.

Adding to 32405540 its reverse (4550423), we get a palindrome (36955963).

The spelling of 32405540 in words is "thirty-two million, four hundred five thousand, five hundred forty".