1977804 has 24 divisors (see below), whose sum is σ = 5127920. Its totient is φ = 659232.

The previous prime is 1977779. The next prime is 1977809. The reversal of 1977804 is 4087791.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1977809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9049 + ... + 9264.

2^1977804 is an apocalyptic number.

It is an amenable number.

1977804 is an abundant number, since it is smaller than the sum of its proper divisors (3150116).

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

1977804 is a wasteful number, since it uses less digits than its factorization.

1977804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18326 (or 18318 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 1977804 is about 1406.3441968451. The cubic root of 1977804 is about 125.5242832753.

It can be divided in two parts, 197 and 7804, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 1977804 in words is "one million, nine hundred seventy-seven thousand, eight hundred four".