1423919991 has 16 divisors (see below), whose sum is σ = 2045322720. Its totient is φ = 875950080.

The previous prime is 1423919977. The next prime is 1423919999. The reversal of 1423919991 is 1999193241.

It is a happy number.

It is not a de Polignac number, because 1423919991 - 2⁶ = 1423919927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1423919991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423919999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161095 + ... + 169703.

It is an arithmetic number, because the mean of its divisors is an integer number (127832670).

Almost surely, 2^1423919991 is an apocalyptic number.

1423919991 is a deficient number, since it is larger than the sum of its proper divisors (621402729).

1423919991 is a wasteful number, since it uses less digits than its factorization.

1423919991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12866.

The product of its digits is 157464, while the sum is 48.

The square root of 1423919991 is about 37734.8643962053. The cubic root of 1423919991 is about 1125.0241946402.

The spelling of 1423919991 in words is "one billion, four hundred twenty-three million, nine hundred nineteen thousand, nine hundred ninety-one".