1978376523 has 4 divisors (see below), whose sum is σ = 2637835368. Its totient is φ = 1318917680.

The previous prime is 1978376509. The next prime is 1978376531. The reversal of 1978376523 is 3256738791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1978376523 - 2¹² = 1978372427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978376563) 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, 329729418 + ... + 329729423.

It is an arithmetic number, because the mean of its divisors is an integer number (659458842).

Almost surely, 2^1978376523 is an apocalyptic number.

1978376523 is a deficient number, since it is larger than the sum of its proper divisors (659458845).

1978376523 is an equidigital number, since it uses as much as digits as its factorization.

1978376523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659458844.

The product of its digits is 1905120, while the sum is 51.

The square root of 1978376523 is about 44478.9447154494. The cubic root of 1978376523 is about 1255.3639411577.

The spelling of 1978376523 in words is "one billion, nine hundred seventy-eight million, three hundred seventy-six thousand, five hundred twenty-three".