398042841987 has 128 divisors (see below), whose sum is σ = 708983193600. Its totient is φ = 215944185600.

The previous prime is 398042841979. The next prime is 398042842003. The reversal of 398042841987 is 789148240893.

398042841987 is a `hidden beast` number, since 3 + 9 + 80 + 428 + 41 + 98 + 7 = 666.

It is not a de Polignac number, because 398042841987 - 2³ = 398042841979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (398042841907) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 68307168 + ... + 68312994.

It is an arithmetic number, because the mean of its divisors is an integer number (5538931200).

Almost surely, 2^398042841987 is an apocalyptic number.

398042841987 is a deficient number, since it is larger than the sum of its proper divisors (310940351613).

398042841987 is a wasteful number, since it uses less digits than its factorization.

398042841987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6094 (or 6088 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 398042841987 in words is "three hundred ninety-eight billion, forty-two million, eight hundred forty-one thousand, nine hundred eighty-seven".