403999949 has 2 divisors, whose sum is σ = 403999950. Its totient is φ = 403999948.

The previous prime is 403999943. The next prime is 403999961. The reversal of 403999949 is 949999304.

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., 365497924 + 38502025 = 19118^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 403999949 - 2⁸ = 403999693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 403999894 and 403999903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403999943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201999974 + 201999975.

It is an arithmetic number, because the mean of its divisors is an integer number (201999975).

Almost surely, 2^403999949 is an apocalyptic number.

It is an amenable number.

403999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

403999949 is an equidigital number, since it uses as much as digits as its factorization.

403999949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 56.

The square root of 403999949 is about 20099.7499735693. The cubic root of 403999949 is about 739.2541480641.

The spelling of 403999949 in words is "four hundred three million, nine hundred ninety-nine thousand, nine hundred forty-nine".