1978724 has 12 divisors (see below), whose sum is σ = 3777648. Its totient is φ = 899400.

The previous prime is 1978709. The next prime is 1978727. The reversal of 1978724 is 4278791.

It is not an unprimeable number, because it can be changed into a prime (1978727) 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, 22442 + ... + 22529.

It is an arithmetic number, because the mean of its divisors is an integer number (314804).

2^1978724 is an apocalyptic number.

It is an amenable number.

1978724 is a deficient number, since it is larger than the sum of its proper divisors (1798924).

1978724 is a wasteful number, since it uses less digits than its factorization.

1978724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44986 (or 44984 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 1978724 is about 1406.6712480178. The cubic root of 1978724 is about 125.5437433161.

The spelling of 1978724 in words is "one million, nine hundred seventy-eight thousand, seven hundred twenty-four".