6987421 has 16 divisors (see below), whose sum is σ = 8501760. Its totient is φ = 5609520.

The previous prime is 6987419. The next prime is 6987427. The reversal of 6987421 is 1247896.

It is not a de Polignac number, because 6987421 - 2¹ = 6987419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13986 + ... + 14476.

It is an arithmetic number, because the mean of its divisors is an integer number (531360).

Almost surely, 2^6987421 is an apocalyptic number.

It is an amenable number.

6987421 is a deficient number, since it is larger than the sum of its proper divisors (1514339).

6987421 is a wasteful number, since it uses less digits than its factorization.

6987421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its digits is 24192, while the sum is 37.

The square root of 6987421 is about 2643.3730345905. The cubic root of 6987421 is about 191.1784649946.

The spelling of 6987421 in words is "six million, nine hundred eighty-seven thousand, four hundred twenty-one".