6402921 has 8 divisors (see below), whose sum is σ = 9756864. Its totient is φ = 3658800.

The previous prime is 6402911. The next prime is 6402923. The reversal of 6402921 is 1292046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6402921 - 2⁵ = 6402889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6402891 and 6402900.

It is not an unprimeable number, because it can be changed into a prime (6402923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152430 + ... + 152471.

It is an arithmetic number, because the mean of its divisors is an integer number (1219608).

Almost surely, 2^6402921 is an apocalyptic number.

It is an amenable number.

6402921 is a deficient number, since it is larger than the sum of its proper divisors (3353943).

6402921 is a wasteful number, since it uses less digits than its factorization.

6402921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304911.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6402921 is about 2530.3993755927. The cubic root of 6402921 is about 185.6917950504.

Adding to 6402921 its reverse (1292046), we get a palindrome (7694967).

The spelling of 6402921 in words is "six million, four hundred two thousand, nine hundred twenty-one".