1423542805 has 4 divisors (see below), whose sum is σ = 1708251372. Its totient is φ = 1138834240.

The previous prime is 1423542793. The next prime is 1423542817. The reversal of 1423542805 is 5082453241.

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

It is an interprime number because it is at equal distance from previous prime (1423542793) and next prime (1423542817).

It can be written as a sum of positive squares in 2 ways, for example, as 980566596 + 442976209 = 31314^2 + 21047^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1423542805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142354276 + ... + 142354285.

It is an arithmetic number, because the mean of its divisors is an integer number (427062843).

Almost surely, 2^1423542805 is an apocalyptic number.

It is an amenable number.

1423542805 is a deficient number, since it is larger than the sum of its proper divisors (284708567).

1423542805 is an equidigital number, since it uses as much as digits as its factorization.

1423542805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284708566.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 1423542805 is about 37729.8662202770. The cubic root of 1423542805 is about 1124.9248489717.

The spelling of 1423542805 in words is "one billion, four hundred twenty-three million, five hundred forty-two thousand, eight hundred five".