6421732 has 6 divisors (see below), whose sum is σ = 11238038. Its totient is φ = 3210864.

The previous prime is 6421729. The next prime is 6421739. The reversal of 6421732 is 2371246.

It can be written as a sum of positive squares in only one way, i.e., 6421156 + 576 = 2534^2 + 24^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6421697 and 6421706.

It is not an unprimeable number, because it can be changed into a prime (6421739) 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 as a sum of consecutive naturals, namely, 802713 + ... + 802720.

Almost surely, 2^6421732 is an apocalyptic number.

It is an amenable number.

6421732 is a deficient number, since it is larger than the sum of its proper divisors (4816306).

6421732 is a wasteful number, since it uses less digits than its factorization.

6421732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605437 (or 1605435 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 6421732 is about 2534.1136517528. The cubic root of 6421732 is about 185.8734638655.

Adding to 6421732 its reverse (2371246), we get a palindrome (8792978).

The spelling of 6421732 in words is "six million, four hundred twenty-one thousand, seven hundred thirty-two".