1618978 has 12 divisors (see below), whose sum is σ = 2580642. Its totient is φ = 761600.

The previous prime is 1618973. The next prime is 1618979. The reversal of 1618978 is 8798161.

It can be written as a sum of positive squares in 3 ways, for example, as 1605289 + 13689 = 1267^2 + 117^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1618978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823 + ... + 1978.

2^1618978 is an apocalyptic number.

1618978 is a deficient number, since it is larger than the sum of its proper divisors (961664).

1618978 is a wasteful number, since it uses less digits than its factorization.

1618978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837 (or 2820 counting only the distinct ones).

The product of its digits is 24192, while the sum is 40.

The square root of 1618978 is about 1272.3906632792. The cubic root of 1618978 is about 117.4213265413.

The spelling of 1618978 in words is "one million, six hundred eighteen thousand, nine hundred seventy-eight".