3991244440422 has 16 divisors (see below), whose sum is σ = 7982514250560. Its totient is φ = 1330410585192.

The previous prime is 3991244440409. The next prime is 3991244440423. The reversal of 3991244440422 is 2240444421993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991244440423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442953 + ... + 3172475.

It is an arithmetic number, because the mean of its divisors is an integer number (498907140660).

Almost surely, 2^{3991244440422} is an apocalyptic number.

3991244440422 is an abundant number, since it is smaller than the sum of its proper divisors (3991269810138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3991244440422 is a wasteful number, since it uses less digits than its factorization.

3991244440422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114147.

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 3991244440422 in words is "three trillion, nine hundred ninety-one billion, two hundred forty-four million, four hundred forty thousand, four hundred twenty-two".