1978040 has 16 divisors (see below), whose sum is σ = 4450680. Its totient is φ = 791200.

The previous prime is 1978037. The next prime is 1978051. The reversal of 1978040 is 408791.

It is a junction number, because it is equal to n+sod(n) for n = 1977994 and 1978012.

It is a congruent number.

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, 24686 + ... + 24765.

2^1978040 is an apocalyptic number.

1978040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978040 is an abundant number, since it is smaller than the sum of its proper divisors (2472640).

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

1978040 is a wasteful number, since it uses less digits than its factorization.

1978040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49462 (or 49458 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1978040 is about 1406.4280998330. The cubic root of 1978040 is about 125.5292757742.

The spelling of 1978040 in words is "one million, nine hundred seventy-eight thousand, forty".