420978 has 8 divisors (see below), whose sum is σ = 841968. Its totient is φ = 140324.

The previous prime is 420977. The next prime is 420997. The reversal of 420978 is 879024.

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

420978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (420977) 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, 35076 + ... + 35087.

It is an arithmetic number, because the mean of its divisors is an integer number (105246).

2⁴²⁰⁹⁷⁸ is an apocalyptic number.

420978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420978 is a wasteful number, since it uses less digits than its factorization.

420978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70168.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 420978 is about 648.8281744807. The cubic root of 420978 is about 74.9468067264.

The spelling of 420978 in words is "four hundred twenty thousand, nine hundred seventy-eight".