1399664045 has 8 divisors (see below), whose sum is σ = 1808796696. Its totient is φ = 1033598016.

The previous prime is 1399664041. The next prime is 1399664047. The reversal of 1399664045 is 5404669931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28665316 + 1370998729 = 5354^2 + 37027^2 .

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 1399664045 - 2² = 1399664041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399664041) 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, 10766582 + ... + 10766711.

It is an arithmetic number, because the mean of its divisors is an integer number (226099587).

Almost surely, 2^1399664045 is an apocalyptic number.

It is an amenable number.

1399664045 is a deficient number, since it is larger than the sum of its proper divisors (409132651).

1399664045 is a wasteful number, since it uses less digits than its factorization.

1399664045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21533311.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1399664045 is about 37412.0842108536. The cubic root of 1399664045 is about 1118.5994517933.

The spelling of 1399664045 in words is "one billion, three hundred ninety-nine million, six hundred sixty-four thousand, forty-five".