133920637 has 16 divisors (see below), whose sum is σ = 142994880. Its totient is φ = 125193600.

The previous prime is 133920623. The next prime is 133920667. The reversal of 133920637 is 736029331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133920637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133920667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193462 + ... + 194152.

It is an arithmetic number, because the mean of its divisors is an integer number (8937180).

Almost surely, 2^133920637 is an apocalyptic number.

It is an amenable number.

133920637 is a deficient number, since it is larger than the sum of its proper divisors (9074243).

133920637 is a wasteful number, since it uses less digits than its factorization.

133920637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 133920637 is about 11572.4084355850. The cubic root of 133920637 is about 511.6219501830.

Adding to 133920637 its reverse (736029331), we get a palindrome (869949968).

The spelling of 133920637 in words is "one hundred thirty-three million, nine hundred twenty thousand, six hundred thirty-seven".