1978941723 has 16 divisors (see below), whose sum is σ = 2879296896. Its totient is φ = 1199010240.

The previous prime is 1978941709. The next prime is 1978941733. The reversal of 1978941723 is 3271498791.

It is not a de Polignac number, because 1978941723 - 2¹⁰ = 1978940699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978941733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149511 + ... + 162207.

It is an arithmetic number, because the mean of its divisors is an integer number (179956056).

Almost surely, 2^1978941723 is an apocalyptic number.

1978941723 is a deficient number, since it is larger than the sum of its proper divisors (900355173).

1978941723 is a wasteful number, since it uses less digits than its factorization.

1978941723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17434.

The product of its digits is 762048, while the sum is 51.

The square root of 1978941723 is about 44485.2978297325. The cubic root of 1978941723 is about 1255.4834775778.

The spelling of 1978941723 in words is "one billion, nine hundred seventy-eight million, nine hundred forty-one thousand, seven hundred twenty-three".