1405927993 has 6 divisors (see below), whose sum is σ = 1413736394. Its totient is φ = 1398125184.

The previous prime is 1405927987. The next prime is 1405928021. The reversal of 1405927993 is 3997295041.

It can be written as a sum of positive squares in only one way, i.e., 1048982544 + 356945449 = 32388^2 + 18893^2 .

It is not a de Polignac number, because 1405927993 - 2²⁹ = 869057081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405967993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519558 + ... + 522256.

Almost surely, 2^1405927993 is an apocalyptic number.

It is an amenable number.

1405927993 is a deficient number, since it is larger than the sum of its proper divisors (7808401).

1405927993 is an frugal number, since it uses more digits than its factorization.

1405927993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591 (or 2892 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 1405927993 is about 37495.7063275250. The cubic root of 1405927993 is about 1120.2656664108.

The spelling of 1405927993 in words is "one billion, four hundred five million, nine hundred twenty-seven thousand, nine hundred ninety-three".