1977213129 has 8 divisors (see below), whose sum is σ = 2637916992. Its totient is φ = 1317325680.

The previous prime is 1977213113. The next prime is 1977213137. The reversal of 1977213129 is 9213127791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1977213129 - 2⁴ = 1977213113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1977213179) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 198429 + ... + 208154.

It is an arithmetic number, because the mean of its divisors is an integer number (329739624).

Almost surely, 2^1977213129 is an apocalyptic number.

It is an amenable number.

1977213129 is a deficient number, since it is larger than the sum of its proper divisors (660703863).

1977213129 is a wasteful number, since it uses less digits than its factorization.

1977213129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408207.

The product of its digits is 47628, while the sum is 42.

The square root of 1977213129 is about 44465.8647616349. The cubic root of 1977213129 is about 1255.1178186030.

The spelling of 1977213129 in words is "one billion, nine hundred seventy-seven million, two hundred thirteen thousand, one hundred twenty-nine".