140420705 has 8 divisors (see below), whose sum is σ = 169436904. Its totient is φ = 111715200.

The previous prime is 140420627. The next prime is 140420713. The reversal of 140420705 is 507024041.

It can be written as a sum of positive squares in 4 ways, for example, as 1934881 + 138485824 = 1391^2 + 11768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140420705 - 2²⁴ = 123643489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 76676 + ... + 78485.

It is an arithmetic number, because the mean of its divisors is an integer number (21179613).

Almost surely, 2^140420705 is an apocalyptic number.

It is an amenable number.

140420705 is a deficient number, since it is larger than the sum of its proper divisors (29016199).

140420705 is a wasteful number, since it uses less digits than its factorization.

140420705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155347.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 140420705 is about 11849.9242613613. The cubic root of 140420705 is about 519.7690110665.

Adding to 140420705 its reverse (507024041), we get a palindrome (647444746).

The spelling of 140420705 in words is "one hundred forty million, four hundred twenty thousand, seven hundred five".