6387421 has 4 divisors (see below), whose sum is σ = 6560092. Its totient is φ = 6214752.

The previous prime is 6387413. The next prime is 6387449. The reversal of 6387421 is 1247836.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3463321 + 2924100 = 1861^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 6387421 - 2³ = 6387413 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6382421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86280 + ... + 86353.

It is an arithmetic number, because the mean of its divisors is an integer number (1640023).

Almost surely, 2^6387421 is an apocalyptic number.

It is an amenable number.

6387421 is a deficient number, since it is larger than the sum of its proper divisors (172671).

6387421 is a wasteful number, since it uses less digits than its factorization.

6387421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172670.

The product of its digits is 8064, while the sum is 31.

The square root of 6387421 is about 2527.3347621556. The cubic root of 6387421 is about 185.5418349277.

The spelling of 6387421 in words is "six million, three hundred eighty-seven thousand, four hundred twenty-one".