1978677 has 12 divisors (see below), whose sum is σ = 2885740. Its totient is φ = 1306368.

The previous prime is 1978673. The next prime is 1978687. The reversal of 1978677 is 7768791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 443556 = 1239^2 + 666^2 .

It is not a de Polignac number, because 1978677 - 2² = 1978673 is a prime.

It is a Duffinian number.

1978677 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28 + ... + 1989.

2^1978677 is an apocalyptic number.

It is an amenable number.

1978677 is a deficient number, since it is larger than the sum of its proper divisors (907063).

1978677 is a wasteful number, since it uses less digits than its factorization.

1978677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132 (or 2129 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 1978677 is about 1406.6545418119. The cubic root of 1978677 is about 125.5427493080.

The spelling of 1978677 in words is "one million, nine hundred seventy-eight thousand, six hundred seventy-seven".