1977231312 has 120 divisors (see below), whose sum is σ = 6400465344. Its totient is φ = 558093312.

The previous prime is 1977231307. The next prime is 1977231337. The reversal of 1977231312 is 2131327791.

It is a happy number.

It is a super-2 number, since 2×1977231312² = 7818887322306482688, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71848 + ... + 95480.

Almost surely, 2^1977231312 is an apocalyptic number.

1977231312 is a gapful number since it is divisible by the number (12) 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 1977231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3200232672).

1977231312 is an abundant number, since it is smaller than the sum of its proper divisors (4423234032).

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

1977231312 is a wasteful number, since it uses less digits than its factorization.

1977231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23737 (or 23728 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 1977231312 is about 44466.0692213737. The cubic root of 1977231312 is about 1255.1216660617.

It can be divided in two parts, 1977 and 231312, that added together give a square (233289 = 483²).

The spelling of 1977231312 in words is "one billion, nine hundred seventy-seven million, two hundred thirty-one thousand, three hundred twelve".