1405670991 has 16 divisors (see below), whose sum is σ = 1901474400. Its totient is φ = 923512320.

The previous prime is 1405670983. The next prime is 1405671011. The reversal of 1405670991 is 1990765041.

It is not a de Polignac number, because 1405670991 - 2³ = 1405670983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405670951) 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 15 ways as a sum of consecutive naturals, for example, 405835 + ... + 409283.

It is an arithmetic number, because the mean of its divisors is an integer number (118842150).

Almost surely, 2^1405670991 is an apocalyptic number.

1405670991 is a deficient number, since it is larger than the sum of its proper divisors (495803409).

1405670991 is a wasteful number, since it uses less digits than its factorization.

1405670991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5386.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 1405670991 is about 37492.2790851663. The cubic root of 1405670991 is about 1120.1974011646.

The spelling of 1405670991 in words is "one billion, four hundred five million, six hundred seventy thousand, nine hundred ninety-one".