381400515787 has 4 divisors (see below), whose sum is σ = 385103433520. Its totient is φ = 377697598056.

The previous prime is 381400515779. The next prime is 381400515841. The reversal of 381400515787 is 787515004183.

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 381400515787 - 2³ = 381400515779 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 381400515787.

It is not an unprimeable number, because it can be changed into a prime (381440515787) 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 3 ways as a sum of consecutive naturals, for example, 1851458712 + ... + 1851458917.

It is an arithmetic number, because the mean of its divisors is an integer number (96275858380).

Almost surely, 2^381400515787 is an apocalyptic number.

381400515787 is a deficient number, since it is larger than the sum of its proper divisors (3702917733).

381400515787 is a wasteful number, since it uses less digits than its factorization.

381400515787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702917732.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 381400515787 in words is "three hundred eighty-one billion, four hundred million, five hundred fifteen thousand, seven hundred eighty-seven".