1405978 has 16 divisors (see below), whose sum is σ = 2494080. Its totient is φ = 581616.

The previous prime is 1405939. The next prime is 1405979. The reversal of 1405978 is 8795041.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1405979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (155880).

2^1405978 is an apocalyptic number.

1405978 is a deficient number, since it is larger than the sum of its proper divisors (1088102).

1405978 is a wasteful number, since it uses less digits than its factorization.

1405978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1405978 is about 1185.7394317471. The cubic root of 1405978 is about 112.0278948376.

The spelling of 1405978 in words is "one million, four hundred five thousand, nine hundred seventy-eight".