1395778865 has 16 divisors (see below), whose sum is σ = 1804578048. Its totient is φ = 1030270656.

The previous prime is 1395778859. The next prime is 1395778883. The reversal of 1395778865 is 5688775931.

It is a cyclic number.

It is not a de Polignac number, because 1395778865 - 2⁶ = 1395778801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232532 + ... + 238458.

It is an arithmetic number, because the mean of its divisors is an integer number (112786128).

Almost surely, 2^1395778865 is an apocalyptic number.

It is an amenable number.

1395778865 is a deficient number, since it is larger than the sum of its proper divisors (408799183).

1395778865 is a wasteful number, since it uses less digits than its factorization.

1395778865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568.

The product of its digits is 12700800, while the sum is 59.

The square root of 1395778865 is about 37360.1239960469. The cubic root of 1395778865 is about 1117.5634918641.

The spelling of 1395778865 in words is "one billion, three hundred ninety-five million, seven hundred seventy-eight thousand, eight hundred sixty-five".