988409891 has 8 divisors (see below), whose sum is σ = 1130897664. Its totient is φ = 846243720.

The previous prime is 988409861. The next prime is 988409893. The reversal of 988409891 is 198904889.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 988409891 - 2¹⁴ = 988393507 is a prime.

It is a super-2 number, since 2×988409891² = 1953908225253263762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988409893) 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, 73775 + ... + 86136.

It is an arithmetic number, because the mean of its divisors is an integer number (141362208).

Almost surely, 2^988409891 is an apocalyptic number.

988409891 is a deficient number, since it is larger than the sum of its proper divisors (142487773).

988409891 is a wasteful number, since it uses less digits than its factorization.

988409891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160801.

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 988409891 is about 31438.9867998318. The cubic root of 988409891 is about 996.1216078539.

The spelling of 988409891 in words is "nine hundred eighty-eight million, four hundred nine thousand, eight hundred ninety-one".