1978232669 has 4 divisors (see below), whose sum is σ = 2260837344. Its totient is φ = 1695627996.

The previous prime is 1978232629. The next prime is 1978232681. The reversal of 1978232669 is 9662328791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9662328791 = 997 ⋅9691403.

It is a cyclic number.

It is not a de Polignac number, because 1978232669 - 2²⁰ = 1977184093 is a prime.

It is a super-2 number, since 2×1978232669² = 7826808985397727122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978232669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978232609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141302327 + ... + 141302340.

It is an arithmetic number, because the mean of its divisors is an integer number (565209336).

Almost surely, 2^1978232669 is an apocalyptic number.

It is an amenable number.

1978232669 is a deficient number, since it is larger than the sum of its proper divisors (282604675).

1978232669 is an equidigital number, since it uses as much as digits as its factorization.

1978232669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282604674.

The product of its digits is 1959552, while the sum is 53.

The square root of 1978232669 is about 44477.3275838376. The cubic root of 1978232669 is about 1255.3335132623. Note that the first 3 decimals are identical.

The spelling of 1978232669 in words is "one billion, nine hundred seventy-eight million, two hundred thirty-two thousand, six hundred sixty-nine".