40338847886978 has 4 divisors (see below), whose sum is σ = 60508271830470. Its totient is φ = 20169423943488.

The previous prime is 40338847886963. The next prime is 40338847887059. The reversal of 40338847886978 is 87968874883304.

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., 31071895163089 + 9266952723889 = 5574217^2 + 3044167^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40338847886896 and 40338847886905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10084711971743 + ... + 10084711971746.

Almost surely, 2^{40338847886978} is an apocalyptic number.

40338847886978 is a deficient number, since it is larger than the sum of its proper divisors (20169423943492).

40338847886978 is a wasteful number, since it uses less digits than its factorization.

40338847886978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20169423943491.

The product of its (nonzero) digits is 12485394432, while the sum is 83.

The spelling of 40338847886978 in words is "forty trillion, three hundred thirty-eight billion, eight hundred forty-seven million, eight hundred eighty-six thousand, nine hundred seventy-eight".