6437421 has 8 divisors (see below), whose sum is σ = 9536960. Its totient is φ = 4291596.

The previous prime is 6437413. The next prime is 6437423. The reversal of 6437421 is 1247346.

It is not a de Polignac number, because 6437421 - 2³ = 6437413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 238423 = 6437421 / (6 + 4 + 3 + 7 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6437423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119185 + ... + 119238.

It is an arithmetic number, because the mean of its divisors is an integer number (1192120).

Almost surely, 2^6437421 is an apocalyptic number.

It is an amenable number.

6437421 is a deficient number, since it is larger than the sum of its proper divisors (3099539).

6437421 is a wasteful number, since it uses less digits than its factorization.

6437421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238432 (or 238426 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 6437421 is about 2537.2073230227. The cubic root of 6437421 is about 186.0247105567.

The spelling of 6437421 in words is "six million, four hundred thirty-seven thousand, four hundred twenty-one".