400001777777 has 8 divisors (see below), whose sum is σ = 457612803456. Its totient is φ = 342507730752.

The previous prime is 400001777767. The next prime is 400001777801. The reversal of 400001777777 is 777777100004.

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

It is a cyclic number.

It is not a de Polignac number, because 400001777777 - 2¹⁸ = 400001515633 is a prime.

It is a Duffinian number.

400001777777 is a modest number, since divided by 777777 gives 400001 as remainder.

It is not an unprimeable number, because it can be changed into a prime (400001777767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29237333 + ... + 29251010.

It is an arithmetic number, because the mean of its divisors is an integer number (57201600432).

Almost surely, 2^400001777777 is an apocalyptic number.

It is an amenable number.

400001777777 is a deficient number, since it is larger than the sum of its proper divisors (57611025679).

400001777777 is an equidigital number, since it uses as much as digits as its factorization.

400001777777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58489327.

The product of its (nonzero) digits is 470596, while the sum is 47.

The spelling of 400001777777 in words is "four hundred billion, one million, seven hundred seventy-seven thousand, seven hundred seventy-seven".