1442172509 has 8 divisors (see below), whose sum is σ = 1530492480. Its totient is φ = 1354239936.

The previous prime is 1442172497. The next prime is 1442172517. The reversal of 1442172509 is 9052712441.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1442172509 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 (1442172209) 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, 89159 + ... + 104084.

It is an arithmetic number, because the mean of its divisors is an integer number (191311560).

Almost surely, 2^1442172509 is an apocalyptic number.

It is an amenable number.

1442172509 is a deficient number, since it is larger than the sum of its proper divisors (88319971).

1442172509 is a wasteful number, since it uses less digits than its factorization.

1442172509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193699.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1442172509 is about 37975.9464529852. The cubic root of 1442172509 is about 1129.8108407624.

The spelling of 1442172509 in words is "one billion, four hundred forty-two million, one hundred seventy-two thousand, five hundred nine".