3936387079978 has 4 divisors (see below), whose sum is σ = 5904580619970. Its totient is φ = 1968193539988.

The previous prime is 3936387079951. The next prime is 3936387080039. The reversal of 3936387079978 is 8799707836393.

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

It can be written as a sum of positive squares in only one way, i.e., 2794102804249 + 1142284275729 = 1671557^2 + 1068777^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3936387079898 and 3936387079907.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984096769993 + ... + 984096769996.

Almost surely, 2^{3936387079978} is an apocalyptic number.

3936387079978 is a deficient number, since it is larger than the sum of its proper divisors (1968193539992).

3936387079978 is a wasteful number, since it uses less digits than its factorization.

3936387079978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968193539991.

The product of its (nonzero) digits is 2592487296, while the sum is 79.

The spelling of 3936387079978 in words is "three trillion, nine hundred thirty-six billion, three hundred eighty-seven million, seventy-nine thousand, nine hundred seventy-eight".