140066813 has 4 divisors (see below), whose sum is σ = 140090880. Its totient is φ = 140042748.

The previous prime is 140066809. The next prime is 140066821. The reversal of 140066813 is 318660041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318660041 = 7 ⋅45522863.

It is a cyclic number.

It is not a de Polignac number, because 140066813 - 2² = 140066809 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 (140066513) 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, 2756 + ... + 16962.

It is an arithmetic number, because the mean of its divisors is an integer number (35022720).

Almost surely, 2^140066813 is an apocalyptic number.

It is an amenable number.

140066813 is a deficient number, since it is larger than the sum of its proper divisors (24067).

140066813 is an equidigital number, since it uses as much as digits as its factorization.

140066813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24066.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 140066813 is about 11834.9825939880. The cubic root of 140066813 is about 519.3319985029.

The spelling of 140066813 in words is "one hundred forty million, sixty-six thousand, eight hundred thirteen".