3978691954 has 8 divisors (see below), whose sum is σ = 6057113328. Its totient is φ = 1959654180.

The previous prime is 3978691943. The next prime is 3978691957. The reversal of 3978691954 is 4591968793.

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

It is a junction number, because it is equal to n+sod(n) for n = 3978691892 and 3978691901.

It is not an unprimeable number, because it can be changed into a prime (3978691957) 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, 14845732 + ... + 14845999.

It is an arithmetic number, because the mean of its divisors is an integer number (757139166).

Almost surely, 2^3978691954 is an apocalyptic number.

3978691954 is a deficient number, since it is larger than the sum of its proper divisors (2078421374).

3978691954 is a wasteful number, since it uses less digits than its factorization.

3978691954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29691800.

The product of its digits is 14696640, while the sum is 61.

The square root of 3978691954 is about 63076.8733689298. The cubic root of 3978691954 is about 1584.5773307988.

The spelling of 3978691954 in words is "three billion, nine hundred seventy-eight million, six hundred ninety-one thousand, nine hundred fifty-four".