403978 has 8 divisors (see below), whose sum is σ = 637920. Its totient is φ = 191340.

The previous prime is 403969. The next prime is 403979. The reversal of 403978 is 879304.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (403979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5278 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (79740).

2⁴⁰³⁹⁷⁸ is an apocalyptic number.

403978 is a deficient number, since it is larger than the sum of its proper divisors (233942).

403978 is a wasteful number, since it uses less digits than its factorization.

403978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10652.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 403978 is about 635.5926368359. The cubic root of 403978 is about 73.9240760123.

The spelling of 403978 in words is "four hundred three thousand, nine hundred seventy-eight".