1977900 has 72 divisors (see below), whose sum is σ = 6041280. Its totient is φ = 498240.

The previous prime is 1977863. The next prime is 1977917. The reversal of 1977900 is 97791.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5527 + ... + 5873.

2^1977900 is an apocalyptic number.

1977900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3020640).

1977900 is an abundant number, since it is smaller than the sum of its proper divisors (4063380).

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

1977900 is a wasteful number, since it uses less digits than its factorization.

1977900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 3969, while the sum is 33.

The square root of 1977900 is about 1406.3783274781. The cubic root of 1977900 is about 125.5263141702.

It can be divided in two parts, 1 and 977900, that added together give a triangular number (977901 = T₁₃₉₈).

The spelling of 1977900 in words is "one million, nine hundred seventy-seven thousand, nine hundred".