4003949 has 2 divisors, whose sum is σ = 4003950. Its totient is φ = 4003948.

The previous prime is 4003939. The next prime is 4003963. The reversal of 4003949 is 9493004.

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., 3928324 + 75625 = 1982^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003949 - 2²⁰ = 2955373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4003939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001974 + 2001975.

It is an arithmetic number, because the mean of its divisors is an integer number (2001975).

Almost surely, 2^4003949 is an apocalyptic number.

It is an amenable number.

4003949 is a deficient number, since it is larger than the sum of its proper divisors (1).

4003949 is an equidigital number, since it uses as much as digits as its factorization.

4003949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 4003949 is about 2000.9870064546. The cubic root of 4003949 is about 158.7923267383.

The spelling of 4003949 in words is "four million, three thousand, nine hundred forty-nine".