6404542 has 4 divisors (see below), whose sum is σ = 9606816. Its totient is φ = 3202270.

The previous prime is 6404527. The next prime is 6404551. The reversal of 6404542 is 2454046.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601134 + ... + 1601137.

It is an arithmetic number, because the mean of its divisors is an integer number (2401704).

Almost surely, 2^6404542 is an apocalyptic number.

6404542 is a deficient number, since it is larger than the sum of its proper divisors (3202274).

6404542 is a wasteful number, since it uses less digits than its factorization.

6404542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202273.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 6404542 is about 2530.7196604919. The cubic root of 6404542 is about 185.7074639929.

Adding to 6404542 its reverse (2454046), we get a palindrome (8858588).

The spelling of 6404542 in words is "six million, four hundred four thousand, five hundred forty-two".