142121769 has 16 divisors (see below), whose sum is σ = 192850944. Its totient is φ = 93085200.

The previous prime is 142121753. The next prime is 142121803. The reversal of 142121769 is 967121241.

It is a happy number.

It is not a de Polignac number, because 142121769 - 2⁴ = 142121753 is a prime.

It is a super-2 number, since 2×142121769² = 40397194447378722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142121069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38724 + ... + 42234.

It is an arithmetic number, because the mean of its divisors is an integer number (12053184).

Almost surely, 2^142121769 is an apocalyptic number.

It is an amenable number.

142121769 is a deficient number, since it is larger than the sum of its proper divisors (50729175).

142121769 is a wasteful number, since it uses less digits than its factorization.

142121769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748.

The product of its digits is 6048, while the sum is 33.

The square root of 142121769 is about 11921.4835066782. The cubic root of 142121769 is about 521.8594291265.

The spelling of 142121769 in words is "one hundred forty-two million, one hundred twenty-one thousand, seven hundred sixty-nine".