4004989 has 2 divisors, whose sum is σ = 4004990. Its totient is φ = 4004988.

The previous prime is 4004951. The next prime is 4005019. The reversal of 4004989 is 9894004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 24964 = 1995^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 4004989 - 2²¹ = 1907837 is a prime.

4004989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4004909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2002494 + 2002495.

It is an arithmetic number, because the mean of its divisors is an integer number (2002495).

Almost surely, 2^4004989 is an apocalyptic number.

It is an amenable number.

4004989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4004989 is an equidigital number, since it uses as much as digits as its factorization.

4004989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 4004989 is about 2001.2468613342. The cubic root of 4004989 is about 158.8060739766.

The spelling of 4004989 in words is "four million, four thousand, nine hundred eighty-nine".