3987954497894 has 16 divisors (see below), whose sum is σ = 6122483529360. Its totient is φ = 1947148428960.

The previous prime is 3987954497869. The next prime is 3987954497897. The reversal of 3987954497894 is 4987944597893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (86).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987954497897) 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 7 ways as a sum of consecutive naturals, for example, 5074949 + ... + 5807840.

It is an arithmetic number, because the mean of its divisors is an integer number (382655220585).

Almost surely, 2^{3987954497894} is an apocalyptic number.

3987954497894 is a deficient number, since it is larger than the sum of its proper divisors (2134529031466).

3987954497894 is a wasteful number, since it uses less digits than its factorization.

3987954497894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10887095.

The product of its digits is 19752284160, while the sum is 86.

Subtracting 3987954497894 from its reverse (4987944597893), we obtain a palindrome (999990099999).

The spelling of 3987954497894 in words is "three trillion, nine hundred eighty-seven billion, nine hundred fifty-four million, four hundred ninety-seven thousand, eight hundred ninety-four".