3807878457421 has 2 divisors, whose sum is σ = 3807878457422. Its totient is φ = 3807878457420.

The previous prime is 3807878457377. The next prime is 3807878457431. The reversal of 3807878457421 is 1247548787083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2443453554025 + 1364424903396 = 1563155^2 + 1168086^2 .

It is a cyclic number.

It is not a de Polignac number, because 3807878457421 - 2³³ = 3799288522829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3807878457431) 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 as a sum of consecutive naturals, namely, 1903939228710 + 1903939228711.

It is an arithmetic number, because the mean of its divisors is an integer number (1903939228711).

Almost surely, 2^{3807878457421} is an apocalyptic number.

It is an amenable number.

3807878457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3807878457421 is an equidigital number, since it uses as much as digits as its factorization.

3807878457421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84295680, while the sum is 64.

The spelling of 3807878457421 in words is "three trillion, eight hundred seven billion, eight hundred seventy-eight million, four hundred fifty-seven thousand, four hundred twenty-one".