409978 has 8 divisors (see below), whose sum is σ = 617760. Its totient is φ = 204060.

The previous prime is 409967. The next prime is 409987. The reversal of 409978 is 879904.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (77220).

2⁴⁰⁹⁹⁷⁸ is an apocalyptic number.

409978 is a deficient number, since it is larger than the sum of its proper divisors (207782).

409978 is a wasteful number, since it uses less digits than its factorization.

409978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 409978 is about 640.2952443990. The cubic root of 409978 is about 74.2882596338.

The spelling of 409978 in words is "four hundred nine thousand, nine hundred seventy-eight".