991401404 has 24 divisors (see below), whose sum is σ = 1984805760. Its totient is φ = 424457136.

The previous prime is 991401403. The next prime is 991401413. The reversal of 991401404 is 404104199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991401403) 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, 11159 + ... + 45905.

It is an arithmetic number, because the mean of its divisors is an integer number (82700240).

Almost surely, 2^991401404 is an apocalyptic number.

It is an amenable number.

991401404 is an abundant number, since it is smaller than the sum of its proper divisors (993404356).

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

991401404 is a wasteful number, since it uses less digits than its factorization.

991401404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35777 (or 35775 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 991401404 is about 31486.5273410708. The cubic root of 991401404 is about 997.1255467687.

The spelling of 991401404 in words is "nine hundred ninety-one million, four hundred one thousand, four hundred four".