1394479769 has 4 divisors (see below), whose sum is σ = 1395417780. Its totient is φ = 1393541760.

The previous prime is 1394479759. The next prime is 1394479813. The reversal of 1394479769 is 9679744931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9679744931 = 89 ⋅108761179.

It can be written as a sum of positive squares in 2 ways, for example, as 906732544 + 487747225 = 30112^2 + 22085^2 .

It is a cyclic number.

It is not a de Polignac number, because 1394479769 - 2⁴ = 1394479753 is a prime.

It is a super-2 number, since 2×1394479769² = 3889147652300586722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394479729) 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, 466772 + ... + 469749.

It is an arithmetic number, because the mean of its divisors is an integer number (348854445).

Almost surely, 2^1394479769 is an apocalyptic number.

It is an amenable number.

1394479769 is a deficient number, since it is larger than the sum of its proper divisors (938011).

1394479769 is an equidigital number, since it uses as much as digits as its factorization.

1394479769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938010.

The product of its digits is 10287648, while the sum is 59.

The square root of 1394479769 is about 37342.7338179732. The cubic root of 1394479769 is about 1117.2166668881.

The spelling of 1394479769 in words is "one billion, three hundred ninety-four million, four hundred seventy-nine thousand, seven hundred sixty-nine".