1396909775 has 6 divisors (see below), whose sum is σ = 1732168152. Its totient is φ = 1117527800.

The previous prime is 1396909763. The next prime is 1396909781. The reversal of 1396909775 is 5779096931.

It is not a de Polignac number, because 1396909775 - 2⁸ = 1396909519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1396909775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27938171 + ... + 27938220.

It is an arithmetic number, because the mean of its divisors is an integer number (288694692).

Almost surely, 2^1396909775 is an apocalyptic number.

1396909775 is a deficient number, since it is larger than the sum of its proper divisors (335258377).

1396909775 is an equidigital number, since it uses as much as digits as its factorization.

1396909775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55876401 (or 55876396 counting only the distinct ones).

The product of its (nonzero) digits is 3214890, while the sum is 56.

The square root of 1396909775 is about 37375.2561864130. The cubic root of 1396909775 is about 1117.8652403648.

The spelling of 1396909775 in words is "one billion, three hundred ninety-six million, nine hundred nine thousand, seven hundred seventy-five".