12977820 has 60 divisors (see below), whose sum is σ = 40716984. Its totient is φ = 3460320.

The previous prime is 12977813. The next prime is 12977821. The reversal of 12977820 is 2877921.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12977821) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2386 + ... + 5625.

Almost surely, 2^12977820 is an apocalyptic number.

12977820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12977820 is an abundant number, since it is smaller than the sum of its proper divisors (27739164).

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

12977820 is a wasteful number, since it uses less digits than its factorization.

12977820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032 (or 8021 counting only the distinct ones).

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

The square root of 12977820 is about 3602.4741498032. The cubic root of 12977820 is about 234.9996680243. Note that the first 3 decimals are identical.

The spelling of 12977820 in words is "twelve million, nine hundred seventy-seven thousand, eight hundred twenty".