142400666 has 4 divisors (see below), whose sum is σ = 213601002. Its totient is φ = 71200332.

The previous prime is 142400663. The next prime is 142400711. The reversal of 142400666 is 666004241.

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

It can be written as a sum of positive squares in only one way, i.e., 124970041 + 17430625 = 11179^2 + 4175^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142400663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35600165 + ... + 35600168.

Almost surely, 2^142400666 is an apocalyptic number.

142400666 is a deficient number, since it is larger than the sum of its proper divisors (71200336).

142400666 is an equidigital number, since it uses as much as digits as its factorization.

142400666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71200335.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 142400666 is about 11933.1750175718. The cubic root of 142400666 is about 522.2005683458.

The spelling of 142400666 in words is "one hundred forty-two million, four hundred thousand, six hundred sixty-six".