1405740989 has 2 divisors, whose sum is σ = 1405740990. Its totient is φ = 1405740988.

The previous prime is 1405740937. The next prime is 1405740991. The reversal of 1405740989 is 9890475041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065043225 + 340697764 = 32635^2 + 18458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405740989 - 2⁸ = 1405740733 is a prime.

It is a super-3 number, since 3×1405740989³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1405740991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405740689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702870494 + 702870495.

It is an arithmetic number, because the mean of its divisors is an integer number (702870495).

Almost surely, 2^1405740989 is an apocalyptic number.

It is an amenable number.

1405740989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405740989 is an equidigital number, since it uses as much as digits as its factorization.

1405740989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1405740989 is about 37493.2125724110. The cubic root of 1405740989 is about 1120.2159949599.

The spelling of 1405740989 in words is "one billion, four hundred five million, seven hundred forty thousand, nine hundred eighty-nine".