7794877421 has 4 divisors (see below), whose sum is σ = 7796719644. Its totient is φ = 7793035200.

The previous prime is 7794877393. The next prime is 7794877423. The reversal of 7794877421 is 1247784977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1247784977 = 32957 ⋅37861.

It can be written as a sum of positive squares in 2 ways, for example, as 6456122500 + 1338754921 = 80350^2 + 36589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7794877421 is a prime.

It is a super-2 number, since 2×7794877421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7794877423) 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, 914750 + ... + 923231.

It is an arithmetic number, because the mean of its divisors is an integer number (1949179911).

Almost surely, 2^7794877421 is an apocalyptic number.

It is an amenable number.

7794877421 is a deficient number, since it is larger than the sum of its proper divisors (1842223).

7794877421 is a wasteful number, since it uses less digits than its factorization.

7794877421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842222.

The product of its digits is 5531904, while the sum is 56.

The square root of 7794877421 is about 88288.6030074097. The cubic root of 7794877421 is about 1982.7582397349.

The spelling of 7794877421 in words is "seven billion, seven hundred ninety-four million, eight hundred seventy-seven thousand, four hundred twenty-one".