401380776787 has 4 divisors (see below), whose sum is σ = 402663143800. Its totient is φ = 400098409776.

The previous prime is 401380776707. The next prime is 401380776803. The reversal of 401380776787 is 787677083104.

It is a happy number.

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 401380776787 - 2¹⁹ = 401380252499 is a prime.

It is a super-2 number, since 2×401380776787² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401380776707) 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, 641183037 + ... + 641183662.

It is an arithmetic number, because the mean of its divisors is an integer number (100665785950).

Almost surely, 2^401380776787 is an apocalyptic number.

401380776787 is a deficient number, since it is larger than the sum of its proper divisors (1282367013).

401380776787 is a wasteful number, since it uses less digits than its factorization.

401380776787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282367012.

The product of its (nonzero) digits is 11063808, while the sum is 58.

The spelling of 401380776787 in words is "four hundred one billion, three hundred eighty million, seven hundred seventy-six thousand, seven hundred eighty-seven".