133988997 has 8 divisors (see below), whose sum is σ = 178758400. Its totient is φ = 89272800.

The previous prime is 133988993. The next prime is 133989029. The reversal of 133988997 is 799889331.

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

It is not a de Polignac number, because 133988997 - 2² = 133988993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133988993) 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, 6997 + ... + 17802.

It is an arithmetic number, because the mean of its divisors is an integer number (22344800).

Almost surely, 2^133988997 is an apocalyptic number.

It is an amenable number.

133988997 is a deficient number, since it is larger than the sum of its proper divisors (44769403).

133988997 is a wasteful number, since it uses less digits than its factorization.

133988997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26603.

The product of its digits is 2939328, while the sum is 57.

The square root of 133988997 is about 11575.3616358194. The cubic root of 133988997 is about 511.7089881185.

The spelling of 133988997 in words is "one hundred thirty-three million, nine hundred eighty-eight thousand, nine hundred ninety-seven".