1423755643 has 4 divisors (see below), whose sum is σ = 1433311200. Its totient is φ = 1414200088.

The previous prime is 1423755629. The next prime is 1423755647. The reversal of 1423755643 is 3465573241.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423755643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1423755596 and 1423755605.

It is not an unprimeable number, because it can be changed into a prime (1423755647) 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, 4777555 + ... + 4777852.

It is an arithmetic number, because the mean of its divisors is an integer number (358327800).

Almost surely, 2^1423755643 is an apocalyptic number.

1423755643 is a deficient number, since it is larger than the sum of its proper divisors (9555557).

1423755643 is an equidigital number, since it uses as much as digits as its factorization.

1423755643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9555556.

The product of its digits is 302400, while the sum is 40.

The square root of 1423755643 is about 37732.6866655424. The cubic root of 1423755643 is about 1124.9809097666.

The spelling of 1423755643 in words is "one billion, four hundred twenty-three million, seven hundred fifty-five thousand, six hundred forty-three".