6921542 has 4 divisors (see below), whose sum is σ = 10382316. Its totient is φ = 3460770.

The previous prime is 6921527. The next prime is 6921547. The reversal of 6921542 is 2451296.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1730384 + ... + 1730387.

It is an arithmetic number, because the mean of its divisors is an integer number (2595579).

Almost surely, 2^6921542 is an apocalyptic number.

6921542 is a deficient number, since it is larger than the sum of its proper divisors (3460774).

6921542 is a wasteful number, since it uses less digits than its factorization.

6921542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460773.

The product of its digits is 4320, while the sum is 29.

The square root of 6921542 is about 2630.8823614902. The cubic root of 6921542 is about 190.5757420698.

The spelling of 6921542 in words is "six million, nine hundred twenty-one thousand, five hundred forty-two".