7919400824449 has 3 divisors (see below), whose sum is σ = 7919403638593. Its totient is φ = 7919398010306.

The previous prime is 7919400824431. The next prime is 7919400824459. The reversal of 7919400824449 is 9444280049197.

The square root of 7919400824449 is 2814143.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 7919400824449 - 2²¹ = 7919398727297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7919400824459) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1407072 + ... + 4221214.

Almost surely, 2^{7919400824449} is an apocalyptic number.

7919400824449 is the 2814143-rd square number.

7919400824449 is the 1407072-nd centered octagonal number.

It is an amenable number.

7919400824449 is a deficient number, since it is larger than the sum of its proper divisors (2814144).

7919400824449 is an frugal number, since it uses more digits than its factorization.

7919400824449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628286 (or 2814143 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 61.

It can be divided in two parts, 7919400 and 824449, that added together give a square (8743849 = 2957²).

The spelling of 7919400824449 in words is "seven trillion, nine hundred nineteen billion, four hundred million, eight hundred twenty-four thousand, four hundred forty-nine".