142807521 has 8 divisors (see below), whose sum is σ = 191511360. Its totient is φ = 94654352.

The previous prime is 142807517. The next prime is 142807523. The reversal of 142807521 is 125708241.

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

It is a cyclic number.

It is not a de Polignac number, because 142807521 - 2² = 142807517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142807523) 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, 137061 + ... + 138098.

It is an arithmetic number, because the mean of its divisors is an integer number (23938920).

Almost surely, 2^142807521 is an apocalyptic number.

It is an amenable number.

142807521 is a deficient number, since it is larger than the sum of its proper divisors (48703839).

142807521 is a wasteful number, since it uses less digits than its factorization.

142807521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275335.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 142807521 is about 11950.2100818354. The cubic root of 142807521 is about 522.6974243835.

The spelling of 142807521 in words is "one hundred forty-two million, eight hundred seven thousand, five hundred twenty-one".