3815985401 has 2 divisors, whose sum is σ = 3815985402. Its totient is φ = 3815985400.

The previous prime is 3815985391. The next prime is 3815985409. The reversal of 3815985401 is 1045895183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3523609600 + 292375801 = 59360^2 + 17099^2 .

It is a cyclic number.

It is not a de Polignac number, because 3815985401 - 2⁶ = 3815985337 is a prime.

It is not a weakly prime, because it can be changed into another prime (3815985409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1907992700 + 1907992701.

It is an arithmetic number, because the mean of its divisors is an integer number (1907992701).

Almost surely, 2^3815985401 is an apocalyptic number.

It is an amenable number.

3815985401 is a deficient number, since it is larger than the sum of its proper divisors (1).

3815985401 is an equidigital number, since it uses as much as digits as its factorization.

3815985401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 3815985401 is about 61773.6626807898. The cubic root of 3815985401 is about 1562.6758536241.

The spelling of 3815985401 in words is "three billion, eight hundred fifteen million, nine hundred eighty-five thousand, four hundred one".