1977798 has 32 divisors (see below), whose sum is σ = 4158720. Its totient is φ = 626400.

The previous prime is 1977779. The next prime is 1977809. The reversal of 1977798 is 8977791.

Its product of digits (222264) is a multiple of the sum of its prime divisors (252).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13023 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (129960).

2^1977798 is an apocalyptic number.

1977798 is an abundant number, since it is smaller than the sum of its proper divisors (2180922).

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

1977798 is a wasteful number, since it uses less digits than its factorization.

1977798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its digits is 222264, while the sum is 48.

The square root of 1977798 is about 1406.3420636531. The cubic root of 1977798 is about 125.5241563422.

It can be divided in two parts, 1977 and 798, that added together give a triangular number (2775 = T₇₄).

The spelling of 1977798 in words is "one million, nine hundred seventy-seven thousand, seven hundred ninety-eight".