140001815 has 4 divisors (see below), whose sum is σ = 168002184. Its totient is φ = 112001448.

The previous prime is 140001811. The next prime is 140001877. The reversal of 140001815 is 518100041.

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

It is a cyclic number.

It is not a de Polignac number, because 140001815 - 2² = 140001811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140001811) 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, 14000177 + ... + 14000186.

It is an arithmetic number, because the mean of its divisors is an integer number (42000546).

Almost surely, 2^140001815 is an apocalyptic number.

140001815 is a deficient number, since it is larger than the sum of its proper divisors (28000369).

140001815 is an equidigital number, since it uses as much as digits as its factorization.

140001815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28000368.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 140001815 is about 11832.2362636993. The cubic root of 140001815 is about 519.2516540747.

Adding to 140001815 its reverse (518100041), we get a palindrome (658101856).

The spelling of 140001815 in words is "one hundred forty million, one thousand, eight hundred fifteen".