1394381689 has 4 divisors (see below), whose sum is σ = 1415193424. Its totient is φ = 1373569956.

The previous prime is 1394381663. The next prime is 1394381699. The reversal of 1394381689 is 9861834931.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 9861834931 = 13 ⋅758602687.

It is a cyclic number.

It is not a de Polignac number, because 1394381689 - 2⁷ = 1394381561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394381609) 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, 10405767 + ... + 10405900.

It is an arithmetic number, because the mean of its divisors is an integer number (353798356).

Almost surely, 2^1394381689 is an apocalyptic number.

It is an amenable number.

1394381689 is a deficient number, since it is larger than the sum of its proper divisors (20811735).

1394381689 is an equidigital number, since it uses as much as digits as its factorization.

1394381689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20811734.

The product of its digits is 1119744, while the sum is 52.

The square root of 1394381689 is about 37341.4205541246. The cubic root of 1394381689 is about 1117.1904733254.

The spelling of 1394381689 in words is "one billion, three hundred ninety-four million, three hundred eighty-one thousand, six hundred eighty-nine".