4002019949 has 2 divisors, whose sum is σ = 4002019950. Its totient is φ = 4002019948.

The previous prime is 4002019939. The next prime is 4002020021. The reversal of 4002019949 is 9499102004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3270696100 + 731323849 = 57190^2 + 27043^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002019949 - 2¹⁶ = 4001954413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4002019919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001009974 + 2001009975.

It is an arithmetic number, because the mean of its divisors is an integer number (2001009975).

Almost surely, 2^4002019949 is an apocalyptic number.

It is an amenable number.

4002019949 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002019949 is an equidigital number, since it uses as much as digits as its factorization.

4002019949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 4002019949 is about 63261.5202868221. The cubic root of 4002019949 is about 1587.6682127663.

The spelling of 4002019949 in words is "four billion, two million, nineteen thousand, nine hundred forty-nine".