142187657 has 4 divisors (see below), whose sum is σ = 142239636. Its totient is φ = 142135680.

The previous prime is 142187651. The next prime is 142187681. The reversal of 142187657 is 756781241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41165056 + 101022601 = 6416^2 + 10051^2 .

It is a cyclic number.

It is not a de Polignac number, because 142187657 - 2¹⁴ = 142171273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142187651) 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 3 ways as a sum of consecutive naturals, for example, 21644 + ... + 27437.

It is an arithmetic number, because the mean of its divisors is an integer number (35559909).

Almost surely, 2^142187657 is an apocalyptic number.

It is an amenable number.

142187657 is a deficient number, since it is larger than the sum of its proper divisors (51979).

142187657 is an equidigital number, since it uses as much as digits as its factorization.

142187657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51978.

The product of its digits is 94080, while the sum is 41.

The square root of 142187657 is about 11924.2466009388. The cubic root of 142187657 is about 521.9400617703.

The spelling of 142187657 in words is "one hundred forty-two million, one hundred eighty-seven thousand, six hundred fifty-seven".