403849661 has 2 divisors, whose sum is σ = 403849662. Its totient is φ = 403849660.

The previous prime is 403849639. The next prime is 403849673. The reversal of 403849661 is 166948304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397244761 + 6604900 = 19931^2 + 2570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403849661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403849601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201924830 + 201924831.

It is an arithmetic number, because the mean of its divisors is an integer number (201924831).

Almost surely, 2^403849661 is an apocalyptic number.

It is an amenable number.

403849661 is a deficient number, since it is larger than the sum of its proper divisors (1).

403849661 is an equidigital number, since it uses as much as digits as its factorization.

403849661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 403849661 is about 20096.0110718520. The cubic root of 403849661 is about 739.1624691691.

The spelling of 403849661 in words is "four hundred three million, eight hundred forty-nine thousand, six hundred sixty-one".