1005400988 has 6 divisors (see below), whose sum is σ = 1759451736. Its totient is φ = 502700492.

The previous prime is 1005400969. The next prime is 1005400993. The reversal of 1005400988 is 8890045001.

It is a super-2 number, since 2×1005400988² = 2021662293342752288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125675120 + ... + 125675127.

It is an arithmetic number, because the mean of its divisors is an integer number (293241956).

Almost surely, 2^1005400988 is an apocalyptic number.

It is an amenable number.

1005400988 is a deficient number, since it is larger than the sum of its proper divisors (754050748).

1005400988 is a wasteful number, since it uses less digits than its factorization.

1005400988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251350251 (or 251350249 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1005400988 is about 31708.0587232962. The cubic root of 1005400988 is about 1001.7970978381.

Adding to 1005400988 its reverse (8890045001), we get a palindrome (9895445989).

The spelling of 1005400988 in words is "one billion, five million, four hundred thousand, nine hundred eighty-eight".