133440642 has 32 divisors (see below), whose sum is σ = 300605760. Its totient is φ = 43869600.

The previous prime is 133440623. The next prime is 133440649. The reversal of 133440642 is 246044331.

133440642 is a `hidden beast` number, since 13 + 3 + 4 + 4 + 0 + 642 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (133440649) 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, 12984 + ... + 20867.

It is an arithmetic number, because the mean of its divisors is an integer number (9393930).

Almost surely, 2^133440642 is an apocalyptic number.

133440642 is an abundant number, since it is smaller than the sum of its proper divisors (167165118).

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

133440642 is a wasteful number, since it uses less digits than its factorization.

133440642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33935 (or 33929 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 133440642 is about 11551.6510508239. The cubic root of 133440642 is about 511.0099709172.

Adding to 133440642 its reverse (246044331), we get a palindrome (379484973).

The spelling of 133440642 in words is "one hundred thirty-three million, four hundred forty thousand, six hundred forty-two".