7721894 has 4 divisors (see below), whose sum is σ = 11582844. Its totient is φ = 3860946.

The previous prime is 7721891. The next prime is 7721911. The reversal of 7721894 is 4981277.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930472 + ... + 1930475.

It is an arithmetic number, because the mean of its divisors is an integer number (2895711).

Almost surely, 2^7721894 is an apocalyptic number.

7721894 is a deficient number, since it is larger than the sum of its proper divisors (3860950).

7721894 is a wasteful number, since it uses less digits than its factorization.

7721894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860949.

The product of its digits is 28224, while the sum is 38.

The square root of 7721894 is about 2778.8296097458. The cubic root of 7721894 is about 197.6550638230.

The spelling of 7721894 in words is "seven million, seven hundred twenty-one thousand, eight hundred ninety-four".