1040001405 has 16 divisors (see below), whose sum is σ = 1665152640. Its totient is φ = 554283968.

The previous prime is 1040001379. The next prime is 1040001407. The reversal of 1040001405 is 5041000401.

It is a cyclic number.

It is not a de Polignac number, because 1040001405 - 2⁹ = 1040000893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040001407) 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, 825 + ... + 45614.

It is an arithmetic number, because the mean of its divisors is an integer number (104072040).

Almost surely, 2^1040001405 is an apocalyptic number.

1040001405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1040001405 is a deficient number, since it is larger than the sum of its proper divisors (625151235).

1040001405 is a wasteful number, since it uses less digits than its factorization.

1040001405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47940.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1040001405 is about 32249.0527767871. The cubic root of 1040001405 is about 1013.1598600664.

Adding to 1040001405 its reverse (5041000401), we get a palindrome (6081001806).

The spelling of 1040001405 in words is "one billion, forty million, one thousand, four hundred five".