1394387273 has 4 divisors (see below), whose sum is σ = 1426814928. Its totient is φ = 1361959620.

The previous prime is 1394387263. The next prime is 1394387321. The reversal of 1394387273 is 3727834931.

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: 3727834931 = 3947 ⋅944473.

It is a cyclic number.

It is not a de Polignac number, because 1394387273 - 2¹⁰ = 1394386249 is a prime.

It is a super-3 number, since 3×1394387273³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394387263) 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, 16213763 + ... + 16213848.

It is an arithmetic number, because the mean of its divisors is an integer number (356703732).

Almost surely, 2^1394387273 is an apocalyptic number.

It is an amenable number.

1394387273 is a deficient number, since it is larger than the sum of its proper divisors (32427655).

1394387273 is an equidigital number, since it uses as much as digits as its factorization.

1394387273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32427654.

The product of its digits is 762048, while the sum is 47.

The square root of 1394387273 is about 37341.4953235673. The cubic root of 1394387273 is about 1117.1919646395.

The spelling of 1394387273 in words is "one billion, three hundred ninety-four million, three hundred eighty-seven thousand, two hundred seventy-three".