1005638799 has 16 divisors (see below), whose sum is σ = 1502282880. Its totient is φ = 593004960.

The previous prime is 1005638797. The next prime is 1005638869. The reversal of 1005638799 is 9978365001.

It is not a de Polignac number, because 1005638799 - 2¹ = 1005638797 is a prime.

It is a super-2 number, since 2×1005638799² = 2022618788108324802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005638797) 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, 410589 + ... + 413030.

It is an arithmetic number, because the mean of its divisors is an integer number (93892680).

Almost surely, 2^1005638799 is an apocalyptic number.

1005638799 is a deficient number, since it is larger than the sum of its proper divisors (496644081).

1005638799 is a wasteful number, since it uses less digits than its factorization.

1005638799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823670.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1005638799 is about 31711.8085103956. The cubic root of 1005638799 is about 1001.8760777977.

The spelling of 1005638799 in words is "one billion, five million, six hundred thirty-eight thousand, seven hundred ninety-nine".