142909897 has 4 divisors (see below), whose sum is σ = 153902980. Its totient is φ = 131916816.

The previous prime is 142909847. The next prime is 142909901. The reversal of 142909897 is 798909241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798909241 = 13 ⋅61454557.

It can be written as a sum of positive squares in 2 ways, for example, as 96452041 + 46457856 = 9821^2 + 6816^2 .

It is a cyclic number.

It is not a de Polignac number, because 142909897 - 2¹⁹ = 142385609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142909897.

It is not an unprimeable number, because it can be changed into a prime (142909807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5496522 + ... + 5496547.

It is an arithmetic number, because the mean of its divisors is an integer number (38475745).

Almost surely, 2^142909897 is an apocalyptic number.

It is an amenable number.

142909897 is a deficient number, since it is larger than the sum of its proper divisors (10993083).

142909897 is a wasteful number, since it uses less digits than its factorization.

142909897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10993082.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 142909897 is about 11954.4927537725. The cubic root of 142909897 is about 522.8222985010.

The spelling of 142909897 in words is "one hundred forty-two million, nine hundred nine thousand, eight hundred ninety-seven".