133987964 has 24 divisors (see below), whose sum is σ = 259993776. Its totient is φ = 59904000.

The previous prime is 133987951. The next prime is 133987969. The reversal of 133987964 is 469789331.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133987969) 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, 22277 + ... + 27644.

It is an arithmetic number, because the mean of its divisors is an integer number (10833074).

Almost surely, 2^133987964 is an apocalyptic number.

It is an amenable number.

133987964 is a deficient number, since it is larger than the sum of its proper divisors (126005812).

133987964 is a wasteful number, since it uses less digits than its factorization.

133987964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49997 (or 49995 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 133987964 is about 11575.3170150973. The cubic root of 133987964 is about 511.7076730932.

The spelling of 133987964 in words is "one hundred thirty-three million, nine hundred eighty-seven thousand, nine hundred sixty-four".