7828121 has 4 divisors (see below), whose sum is σ = 8946432. Its totient is φ = 6709812.

The previous prime is 7828111. The next prime is 7828123. The reversal of 7828121 is 1218287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7828121 is a prime.

It is a super-2 number, since 2×7828121² = 122558956781282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7828123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559145 + ... + 559158.

It is an arithmetic number, because the mean of its divisors is an integer number (2236608).

Almost surely, 2^7828121 is an apocalyptic number.

It is an amenable number.

7828121 is a deficient number, since it is larger than the sum of its proper divisors (1118311).

7828121 is a wasteful number, since it uses less digits than its factorization.

7828121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118310.

The product of its digits is 1792, while the sum is 29.

The square root of 7828121 is about 2797.8779458726. The cubic root of 7828121 is about 198.5572930064.

The spelling of 7828121 in words is "seven million, eight hundred twenty-eight thousand, one hundred twenty-one".