1389694357 has 8 divisors (see below), whose sum is σ = 1410936984. Its totient is φ = 1368511488.

The previous prime is 1389694351. The next prime is 1389694363. The reversal of 1389694357 is 7534969831.

It is an interprime number because it is at equal distance from previous prime (1389694351) and next prime (1389694363).

It can be written as a sum of positive squares in 4 ways, for example, as 2802276 + 1386892081 = 1674^2 + 37241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389694357 - 2³ = 1389694349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1389694298 and 1389694307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389694351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33093 + ... + 62245.

It is an arithmetic number, because the mean of its divisors is an integer number (176367123).

Almost surely, 2^1389694357 is an apocalyptic number.

It is an amenable number.

1389694357 is a deficient number, since it is larger than the sum of its proper divisors (21242627).

1389694357 is an equidigital number, since it uses as much as digits as its factorization.

1389694357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29879.

The product of its digits is 4898880, while the sum is 55.

The square root of 1389694357 is about 37278.6045473808. The cubic root of 1389694357 is about 1115.9372245471.

The spelling of 1389694357 in words is "one billion, three hundred eighty-nine million, six hundred ninety-four thousand, three hundred fifty-seven".