1398791385 has 12 divisors (see below), whose sum is σ = 2424571812. Its totient is φ = 746022048.

The previous prime is 1398791371. The next prime is 1398791431. The reversal of 1398791385 is 5831978931.

It can be written as a sum of positive squares in 2 ways, for example, as 184199184 + 1214592201 = 13572^2 + 34851^2 .

It is not a de Polignac number, because 1398791385 - 2⁸ = 1398791129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15542082 + ... + 15542171.

It is an arithmetic number, because the mean of its divisors is an integer number (202047651).

Almost surely, 2^1398791385 is an apocalyptic number.

1398791385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1398791385 is a deficient number, since it is larger than the sum of its proper divisors (1025780427).

1398791385 is a wasteful number, since it uses less digits than its factorization.

1398791385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31084264 (or 31084261 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1398791385 is about 37400.4195832079. The cubic root of 1398791385 is about 1118.3669293433.

The spelling of 1398791385 in words is "one billion, three hundred ninety-eight million, seven hundred ninety-one thousand, three hundred eighty-five".