6923421 has 8 divisors (see below), whose sum is σ = 10256960. Its totient is φ = 4615596.

The previous prime is 6923419. The next prime is 6923459. The reversal of 6923421 is 1243296.

It is not a de Polignac number, because 6923421 - 2¹ = 6923419 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: 256423 = 6923421 / (6 + 9 + 2 + 3 + 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 (6923461) 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, 128185 + ... + 128238.

It is an arithmetic number, because the mean of its divisors is an integer number (1282120).

Almost surely, 2^6923421 is an apocalyptic number.

It is an amenable number.

6923421 is a deficient number, since it is larger than the sum of its proper divisors (3333539).

6923421 is a wasteful number, since it uses less digits than its factorization.

6923421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256432 (or 256426 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 6923421 is about 2631.2394417840. The cubic root of 6923421 is about 190.5929857910.

The spelling of 6923421 in words is "six million, nine hundred twenty-three thousand, four hundred twenty-one".