1045439999 has 16 divisors (see below), whose sum is σ = 1115265024. Its totient is φ = 977776800.

The previous prime is 1045439981. The next prime is 1045440023. The reversal of 1045439999 is 9999345401.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1045439999 - 2²⁰ = 1044391423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1045439999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045439909) 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, 402194 + ... + 404784.

It is an arithmetic number, because the mean of its divisors is an integer number (69704064).

Almost surely, 2^1045439999 is an apocalyptic number.

1045439999 is a deficient number, since it is larger than the sum of its proper divisors (69825025).

1045439999 is a wasteful number, since it uses less digits than its factorization.

1045439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1045439999 is about 32333.2645892740. The cubic root of 1045439999 is about 1014.9228666502.

The spelling of 1045439999 in words is "one billion, forty-five million, four hundred thirty-nine thousand, nine hundred ninety-nine".