133445442 has 48 divisors (see below), whose sum is σ = 292085568. Its totient is φ = 40622400.

The previous prime is 133445437. The next prime is 133445449. The reversal of 133445442 is 244544331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133445449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101763 + ... + 103065.

It is an arithmetic number, because the mean of its divisors is an integer number (6085116).

Almost surely, 2^133445442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133445442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146042784).

133445442 is an abundant number, since it is smaller than the sum of its proper divisors (158640126).

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

133445442 is a wasteful number, since it uses less digits than its factorization.

133445442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435 (or 1422 counting only the distinct ones).

The product of its digits is 23040, while the sum is 30.

The square root of 133445442 is about 11551.8588114641. The cubic root of 133445442 is about 511.0160980321.

Adding to 133445442 its reverse (244544331), we get a palindrome (377989773).

The spelling of 133445442 in words is "one hundred thirty-three million, four hundred forty-five thousand, four hundred forty-two".