7854921 has 8 divisors (see below), whose sum is σ = 11636960. Its totient is φ = 5236596.

The previous prime is 7854893. The next prime is 7854949. The reversal of 7854921 is 1294587.

It is an interprime number because it is at equal distance from previous prime (7854893) and next prime (7854949).

It is not a de Polignac number, because 7854921 - 2⁹ = 7854409 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7854991) 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, 145435 + ... + 145488.

It is an arithmetic number, because the mean of its divisors is an integer number (1454620).

Almost surely, 2^7854921 is an apocalyptic number.

It is an amenable number.

7854921 is a deficient number, since it is larger than the sum of its proper divisors (3782039).

7854921 is a wasteful number, since it uses less digits than its factorization.

7854921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290932 (or 290926 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 7854921 is about 2802.6631977460. The cubic root of 7854921 is about 198.7836254962.

The spelling of 7854921 in words is "seven million, eight hundred fifty-four thousand, nine hundred twenty-one".