1345405357 has 4 divisors (see below), whose sum is σ = 1345485280. Its totient is φ = 1345325436.

The previous prime is 1345405291. The next prime is 1345405387. The reversal of 1345405357 is 7535045431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7535045431 = 1019 ⋅7394549.

It is a cyclic number.

It is not a de Polignac number, because 1345405357 - 2²⁷ = 1211187629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345405387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3807 + ... + 52012.

It is an arithmetic number, because the mean of its divisors is an integer number (336371320).

Almost surely, 2^1345405357 is an apocalyptic number.

It is an amenable number.

1345405357 is a deficient number, since it is larger than the sum of its proper divisors (79923).

1345405357 is an equidigital number, since it uses as much as digits as its factorization.

1345405357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79922.

The product of its (nonzero) digits is 126000, while the sum is 37.

The square root of 1345405357 is about 36679.7676791988. The cubic root of 1345405357 is about 1103.9541866994.

The spelling of 1345405357 in words is "one billion, three hundred forty-five million, four hundred five thousand, three hundred fifty-seven".