3998737 has 2 divisors, whose sum is σ = 3998738. Its totient is φ = 3998736.

The previous prime is 3998719. The next prime is 3998741. The reversal of 3998737 is 7378993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3154176 + 844561 = 1776^2 + 919^2 .

It is an emirp because it is prime and its reverse (7378993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3998737 - 2⁷ = 3998609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3998707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999368 + 1999369.

It is an arithmetic number, because the mean of its divisors is an integer number (1999369).

Almost surely, 2^3998737 is an apocalyptic number.

It is an amenable number.

3998737 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998737 is an equidigital number, since it uses as much as digits as its factorization.

3998737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 46.

The square root of 3998737 is about 1999.6842250715. The cubic root of 3998737 is about 158.7233960420.

The spelling of 3998737 in words is "three million, nine hundred ninety-eight thousand, seven hundred thirty-seven".