3945381499 has 2 divisors, whose sum is σ = 3945381500. Its totient is φ = 3945381498.

The previous prime is 3945381493. The next prime is 3945381509. The reversal of 3945381499 is 9941835493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3945381499 - 2¹⁵ = 3945348731 is a prime.

It is not a weakly prime, because it can be changed into another prime (3945381493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972690749 + 1972690750.

It is an arithmetic number, because the mean of its divisors is an integer number (1972690750).

Almost surely, 2^3945381499 is an apocalyptic number.

3945381499 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945381499 is an equidigital number, since it uses as much as digits as its factorization.

3945381499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 55.

The square root of 3945381499 is about 62812.2718821728. The cubic root of 3945381499 is about 1580.1427926013.

The spelling of 3945381499 in words is "three billion, nine hundred forty-five million, three hundred eighty-one thousand, four hundred ninety-nine".