381400189845 has 16 divisors (see below), whose sum is σ = 646136792640. Its totient is φ = 191447938304.

The previous prime is 381400189837. The next prime is 381400189867. The reversal of 381400189845 is 548981004183.

It is a cyclic number.

It is not a de Polignac number, because 381400189845 - 2³ = 381400189837 is a prime.

It is a super-2 number, since 2×381400189845² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 747843255 + ... + 747843764.

It is an arithmetic number, because the mean of its divisors is an integer number (40383549540).

Almost surely, 2^381400189845 is an apocalyptic number.

It is an amenable number.

381400189845 is a deficient number, since it is larger than the sum of its proper divisors (264736602795).

381400189845 is a wasteful number, since it uses less digits than its factorization.

381400189845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495687044.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 381400189845 in words is "three hundred eighty-one billion, four hundred million, one hundred eighty-nine thousand, eight hundred forty-five".