7990238543401 has 3 divisors (see below), whose sum is σ = 7990241370103. Its totient is φ = 7990235716700.

The previous prime is 7990238543369. The next prime is 7990238543411. The reversal of 7990238543401 is 1043458320997.

The square root of 7990238543401 is 2826701.

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 can be written as a sum of positive squares in only one way, i.e., 1899708133401 + 6090530410000 = 1378299^2 + 2467900^2 .

It is not a de Polignac number, because 7990238543401 - 2⁵ = 7990238543369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7990238543411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1413351 + ... + 4240051.

Almost surely, 2^{7990238543401} is an apocalyptic number.

7990238543401 is the 2826701-st square number.

7990238543401 is the 1413351-st centered octagonal number.

It is an amenable number.

7990238543401 is a deficient number, since it is larger than the sum of its proper divisors (2826702).

7990238543401 is an frugal number, since it uses more digits than its factorization.

7990238543401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653402 (or 2826701 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 7990238543401 in words is "seven trillion, nine hundred ninety billion, two hundred thirty-eight million, five hundred forty-three thousand, four hundred one".