1977209676 has 120 divisors (see below), whose sum is σ = 5758719120. Its totient is φ = 587357568.

The previous prime is 1977209659. The next prime is 1977209683. The reversal of 1977209676 is 6769027791.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 114055 + ... + 130241.

It is an arithmetic number, because the mean of its divisors is an integer number (47989326).

Almost surely, 2^1977209676 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977209676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879359560).

1977209676 is an abundant number, since it is smaller than the sum of its proper divisors (3781509444).

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

1977209676 is a wasteful number, since it uses less digits than its factorization.

1977209676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245 (or 16234 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The square root of 1977209676 is about 44465.8259340811. The cubic root of 1977209676 is about 1255.1170879577.

The spelling of 1977209676 in words is "one billion, nine hundred seventy-seven million, two hundred nine thousand, six hundred seventy-six".