7813969 has 4 divisors (see below), whose sum is σ = 7912960. Its totient is φ = 7714980.

The previous prime is 7813957. The next prime is 7813973. The reversal of 7813969 is 9693187.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9693187 = 7 ⋅1384741.

It is a cyclic number.

It is not a de Polignac number, because 7813969 - 2⁵ = 7813937 is a prime.

It is a super-2 number, since 2×7813969² = 122116223065922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7813909) 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, 49377 + ... + 49534.

It is an arithmetic number, because the mean of its divisors is an integer number (1978240).

Almost surely, 2^7813969 is an apocalyptic number.

7813969 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

7813969 is a deficient number, since it is larger than the sum of its proper divisors (98991).

7813969 is an equidigital number, since it uses as much as digits as its factorization.

7813969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98990.

The product of its digits is 81648, while the sum is 43.

The square root of 7813969 is about 2795.3477422317. The cubic root of 7813969 is about 198.4375674747.

The spelling of 7813969 in words is "seven million, eight hundred thirteen thousand, nine hundred sixty-nine".