400841789779 has 4 divisors (see below), whose sum is σ = 410618418840. Its totient is φ = 391065160720.

The previous prime is 400841789759. The next prime is 400841789797. The reversal of 400841789779 is 977987148004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400841789779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400841789779.

It is not an unprimeable number, because it can be changed into a prime (400841789729) 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, 4888314469 + ... + 4888314550.

It is an arithmetic number, because the mean of its divisors is an integer number (102654604710).

Almost surely, 2^400841789779 is an apocalyptic number.

400841789779 is a deficient number, since it is larger than the sum of its proper divisors (9776629061).

400841789779 is an equidigital number, since it uses as much as digits as its factorization.

400841789779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9776629060.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 400841789779 in words is "four hundred billion, eight hundred forty-one million, seven hundred eighty-nine thousand, seven hundred seventy-nine".