1405944813 has 64 divisors (see below), whose sum is σ = 2375690240. Its totient is φ = 719808768.

The previous prime is 1405944811. The next prime is 1405944821. The reversal of 1405944813 is 3184495041.

It is not a de Polignac number, because 1405944813 - 2¹ = 1405944811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405944811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2687970 + ... + 2688492.

It is an arithmetic number, because the mean of its divisors is an integer number (37120160).

Almost surely, 2^1405944813 is an apocalyptic number.

1405944813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1405944813 is a deficient number, since it is larger than the sum of its proper divisors (969745427).

1405944813 is a wasteful number, since it uses less digits than its factorization.

1405944813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1405944813 is about 37495.9306192019. The cubic root of 1405944813 is about 1120.2701338737.

The spelling of 1405944813 in words is "one billion, four hundred five million, nine hundred forty-four thousand, eight hundred thirteen".