1978859954 has 8 divisors (see below), whose sum is σ = 2978779440. Its totient is φ = 985933476.

The previous prime is 1978859951. The next prime is 1978859969. The reversal of 1978859954 is 4599588791.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1978859951) 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, 1747544 + ... + 1748675.

It is an arithmetic number, because the mean of its divisors is an integer number (372347430).

Almost surely, 2^1978859954 is an apocalyptic number.

1978859954 is a deficient number, since it is larger than the sum of its proper divisors (999919486).

1978859954 is a wasteful number, since it uses less digits than its factorization.

1978859954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496504.

The product of its digits is 32659200, while the sum is 65.

The square root of 1978859954 is about 44484.3787637863. The cubic root of 1978859954 is about 1255.4661853316.

The spelling of 1978859954 in words is "one billion, nine hundred seventy-eight million, eight hundred fifty-nine thousand, nine hundred fifty-four".