1405104640 has 40 divisors (see below), whose sum is σ = 3368964060. Its totient is φ = 562040832.

The previous prime is 1405104619. The next prime is 1405104653. The reversal of 1405104640 is 464015041.

It can be written as a sum of positive squares in 2 ways, for example, as 1329623296 + 75481344 = 36464^2 + 8688^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271875 + ... + 276994.

Almost surely, 2^1405104640 is an apocalyptic number.

1405104640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405104640 is an abundant number, since it is smaller than the sum of its proper divisors (1963859420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1405104640 is an frugal number, since it uses more digits than its factorization.

1405104640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548892 (or 548876 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1405104640 is about 37484.7254224971. The cubic root of 1405104640 is about 1120.0469368085.

Adding to 1405104640 its reverse (464015041), we get a palindrome (1869119681).

The spelling of 1405104640 in words is "one billion, four hundred five million, one hundred four thousand, six hundred forty".