6404553 has 6 divisors (see below), whose sum is σ = 9251034. Its totient is φ = 4269696.

The previous prime is 6404551. The next prime is 6404581. The reversal of 6404553 is 3554046.

It can be written as a sum of positive squares in only one way, i.e., 5212089 + 1192464 = 2283^2 + 1092^2 .

It is not a de Polignac number, because 6404553 - 2¹ = 6404551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6404551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355800 + ... + 355817.

It is an arithmetic number, because the mean of its divisors is an integer number (1541839).

Almost surely, 2^6404553 is an apocalyptic number.

It is an amenable number.

6404553 is a deficient number, since it is larger than the sum of its proper divisors (2846481).

6404553 is a wasteful number, since it uses less digits than its factorization.

6404553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711623 (or 711620 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 6404553 is about 2530.7218337858. The cubic root of 6404553 is about 185.7075703123.

Adding to 6404553 its reverse (3554046), we get a palindrome (9958599).

The spelling of 6404553 in words is "six million, four hundred four thousand, five hundred fifty-three".