1399903745 has 4 divisors (see below), whose sum is σ = 1679884500. Its totient is φ = 1119922992.

The previous prime is 1399903741. The next prime is 1399903751. The reversal of 1399903745 is 5473099931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5473099931 = 13 ⋅421007687.

It can be written as a sum of positive squares in 2 ways, for example, as 833130496 + 566773249 = 28864^2 + 23807^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399903745 - 2² = 1399903741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1399903693 and 1399903702.

It is not an unprimeable number, because it can be changed into a prime (1399903741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139990370 + ... + 139990379.

It is an arithmetic number, because the mean of its divisors is an integer number (419971125).

Almost surely, 2^1399903745 is an apocalyptic number.

It is an amenable number.

1399903745 is a deficient number, since it is larger than the sum of its proper divisors (279980755).

1399903745 is an equidigital number, since it uses as much as digits as its factorization.

1399903745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279980754.

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 1399903745 is about 37415.2875840879. The cubic root of 1399903745 is about 1118.6633035404.

The spelling of 1399903745 in words is "one billion, three hundred ninety-nine million, nine hundred three thousand, seven hundred forty-five".