142811985 has 16 divisors (see below), whose sum is σ = 241940736. Its totient is φ = 71685888.

The previous prime is 142811983. The next prime is 142812011. The reversal of 142811985 is 589118241.

It is not a de Polignac number, because 142811985 - 2¹ = 142811983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142811983) 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, 279769 + ... + 280278.

It is an arithmetic number, because the mean of its divisors is an integer number (15121296).

Almost surely, 2^142811985 is an apocalyptic number.

142811985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

142811985 is a deficient number, since it is larger than the sum of its proper divisors (99128751).

142811985 is a wasteful number, since it uses less digits than its factorization.

142811985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560072.

The product of its digits is 23040, while the sum is 39.

The square root of 142811985 is about 11950.3968553350. The cubic root of 142811985 is about 522.7028706349.

The spelling of 142811985 in words is "one hundred forty-two million, eight hundred eleven thousand, nine hundred eighty-five".