32421440 has 56 divisors (see below), whose sum is σ = 78345792. Its totient is φ = 12776960.

The previous prime is 32421437. The next prime is 32421451. The reversal of 32421440 is 4412423.

It is a super-2 number, since 2×32421440² = 2102299543347200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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, 22007 + ... + 23433.

It is an arithmetic number, because the mean of its divisors is an integer number (1399032).

Almost surely, 2^32421440 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 32421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39172896).

32421440 is an abundant number, since it is smaller than the sum of its proper divisors (45924352).

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

32421440 is a wasteful number, since it uses less digits than its factorization.

32421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 32421440 is about 5693.9827888746. The cubic root of 32421440 is about 318.8678743847.

Adding to 32421440 its reverse (4412423), we get a palindrome (36833863).

The spelling of 32421440 in words is "thirty-two million, four hundred twenty-one thousand, four hundred forty".