403939 has 4 divisors (see below), whose sum is σ = 406800. Its totient is φ = 401080.

The previous prime is 403933. The next prime is 403951. The reversal of 403939 is 939304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403939 is a prime.

It is a Duffinian number.

403939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (403933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207 + ... + 1504.

It is an arithmetic number, because the mean of its divisors is an integer number (101700).

2⁴⁰³⁹³⁹ is an apocalyptic number.

403939 is a deficient number, since it is larger than the sum of its proper divisors (2861).

403939 is a wasteful number, since it uses less digits than its factorization.

403939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 403939 is about 635.5619560672. The cubic root of 403939 is about 73.9216970611.

The spelling of 403939 in words is "four hundred three thousand, nine hundred thirty-nine".