1978746 has 32 divisors (see below), whose sum is σ = 4935168. Its totient is φ = 513840.

The previous prime is 1978741. The next prime is 1978763. The reversal of 1978746 is 6478791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1978698 and 1978707.

It is not an unprimeable number, because it can be changed into a prime (1978741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1680 + ... + 2603.

It is an arithmetic number, because the mean of its divisors is an integer number (154224).

2^1978746 is an apocalyptic number.

1978746 is an abundant number, since it is smaller than the sum of its proper divisors (2956422).

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

1978746 is a wasteful number, since it uses less digits than its factorization.

1978746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its digits is 84672, while the sum is 42.

The square root of 1978746 is about 1406.6790678758. The cubic root of 1978746 is about 125.5442085910.

The spelling of 1978746 in words is "one million, nine hundred seventy-eight thousand, seven hundred forty-six".