3878092021 has 2 divisors, whose sum is σ = 3878092022. Its totient is φ = 3878092020.

The previous prime is 3878091979. The next prime is 3878092039. The reversal of 3878092021 is 1202908783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3847720900 + 30371121 = 62030^2 + 5511^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878092021 - 2⁹ = 3878091509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3878092061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939046010 + 1939046011.

It is an arithmetic number, because the mean of its divisors is an integer number (1939046011).

Almost surely, 2^3878092021 is an apocalyptic number.

It is an amenable number.

3878092021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878092021 is an equidigital number, since it uses as much as digits as its factorization.

3878092021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 3878092021 is about 62274.3287478878. The cubic root of 3878092021 is about 1571.1079878115.

The spelling of 3878092021 in words is "three billion, eight hundred seventy-eight million, ninety-two thousand, twenty-one".