140823479 has 4 divisors (see below), whose sum is σ = 144258240. Its totient is φ = 137388720.

The previous prime is 140823451. The next prime is 140823493. The reversal of 140823479 is 974328041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974328041 = 3499 ⋅278459.

It is a cyclic number.

It is not a de Polignac number, because 140823479 - 2²⁰ = 139774903 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 (140823499) 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, 1717319 + ... + 1717400.

It is an arithmetic number, because the mean of its divisors is an integer number (36064560).

Almost surely, 2^140823479 is an apocalyptic number.

140823479 is a deficient number, since it is larger than the sum of its proper divisors (3434761).

140823479 is an equidigital number, since it uses as much as digits as its factorization.

140823479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434760.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 140823479 is about 11866.9068842728. The cubic root of 140823479 is about 520.2654943555.

The spelling of 140823479 in words is "one hundred forty million, eight hundred twenty-three thousand, four hundred seventy-nine".