7941191921398 has 4 divisors (see below), whose sum is σ = 11911787882100. Its totient is φ = 3970595960698.

The previous prime is 7941191921357. The next prime is 7941191921461. The reversal of 7941191921398 is 8931291911497.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985297980348 + ... + 1985297980351.

It is an arithmetic number, because the mean of its divisors is an integer number (2977946970525).

Almost surely, 2^{7941191921398} is an apocalyptic number.

7941191921398 is a deficient number, since it is larger than the sum of its proper divisors (3970595960702).

7941191921398 is a wasteful number, since it uses less digits than its factorization.

7941191921398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970595960701.

The product of its digits is 8817984, while the sum is 64.

Subtracting 7941191921398 from its reverse (8931291911497), we obtain a palindrome (990099990099).

The spelling of 7941191921398 in words is "seven trillion, nine hundred forty-one billion, one hundred ninety-one million, nine hundred twenty-one thousand, three hundred ninety-eight".