403979 has 2 divisors, whose sum is σ = 403980. Its totient is φ = 403978.

The previous prime is 403969. The next prime is 403981. The reversal of 403979 is 979304.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403979 is a prime.

Together with 403981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (403969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201989 + 201990.

It is an arithmetic number, because the mean of its divisors is an integer number (201990).

2⁴⁰³⁹⁷⁹ is an apocalyptic number.

403979 is a deficient number, since it is larger than the sum of its proper divisors (1).

403979 is an equidigital number, since it uses as much as digits as its factorization.

403979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 403979 is about 635.5934235028. The cubic root of 403979 is about 73.9241370090.

The spelling of 403979 in words is "four hundred three thousand, nine hundred seventy-nine".