401978188110239 has 4 divisors (see below), whose sum is σ = 432899587195656. Its totient is φ = 371056789024824.

The previous prime is 401978188110151. The next prime is 401978188110271. The reversal of 401978188110239 is 932011881879104.

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

It is a cyclic number.

It is not a de Polignac number, because 401978188110239 - 2³⁶ = 401909468633503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401978188110299) 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, 15460699542689 + ... + 15460699542714.

It is an arithmetic number, because the mean of its divisors is an integer number (108224896798914).

Almost surely, 2^{401978188110239} is an apocalyptic number.

401978188110239 is a deficient number, since it is larger than the sum of its proper divisors (30921399085417).

401978188110239 is a wasteful number, since it uses less digits than its factorization.

401978188110239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30921399085416.

The product of its (nonzero) digits is 6967296, while the sum is 62.

The spelling of 401978188110239 in words is "four hundred one trillion, nine hundred seventy-eight billion, one hundred eighty-eight million, one hundred ten thousand, two hundred thirty-nine".