1004388993 has 6 divisors (see below), whose sum is σ = 1450784114. Its totient is φ = 669592656.

The previous prime is 1004388977. The next prime is 1004389007. The reversal of 1004388993 is 3998834001.

It can be written as a sum of positive squares in only one way, i.e., 630662769 + 373726224 = 25113^2 + 19332^2 .

It is not a de Polignac number, because 1004388993 - 2⁴ = 1004388977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1004388923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55799380 + ... + 55799397.

Almost surely, 2^1004388993 is an apocalyptic number.

It is an amenable number.

1004388993 is a deficient number, since it is larger than the sum of its proper divisors (446395121).

1004388993 is a wasteful number, since it uses less digits than its factorization.

1004388993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111598783 (or 111598780 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1004388993 is about 31692.0966961796. The cubic root of 1004388993 is about 1001.4608625082.

The spelling of 1004388993 in words is "one billion, four million, three hundred eighty-eight thousand, nine hundred ninety-three".