142640805 has 16 divisors (see below), whose sum is σ = 229388544. Its totient is φ = 75687360.

The previous prime is 142640801. The next prime is 142640843. The reversal of 142640805 is 508046241.

It is not a de Polignac number, because 142640805 - 2² = 142640801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142640801) 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, 21181 + ... + 27090.

It is an arithmetic number, because the mean of its divisors is an integer number (14336784).

Almost surely, 2^142640805 is an apocalyptic number.

142640805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

142640805 is a deficient number, since it is larger than the sum of its proper divisors (86747739).

142640805 is a wasteful number, since it uses less digits than its factorization.

142640805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48476.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 142640805 is about 11943.2326026081. The cubic root of 142640805 is about 522.4939431393.

The spelling of 142640805 in words is "one hundred forty-two million, six hundred forty thousand, eight hundred five".