1361399743 has 4 divisors (see below), whose sum is σ = 1485163368. Its totient is φ = 1237636120.

The previous prime is 1361399671. The next prime is 1361399747. The reversal of 1361399743 is 3479931631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3479931631 = 11 ⋅316357421.

It is a cyclic number.

It is not a de Polignac number, because 1361399743 - 2²¹ = 1359302591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1361399693 and 1361399702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361399747) 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, 61881796 + ... + 61881817.

It is an arithmetic number, because the mean of its divisors is an integer number (371290842).

Almost surely, 2^1361399743 is an apocalyptic number.

1361399743 is a deficient number, since it is larger than the sum of its proper divisors (123763625).

1361399743 is a wasteful number, since it uses less digits than its factorization.

1361399743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123763624.

The product of its digits is 367416, while the sum is 46.

The square root of 1361399743 is about 36897.1508791668. The cubic root of 1361399743 is about 1108.3116238585.

It can be divided in two parts, 1361 and 399743, that added together give a palindrome (401104).

The spelling of 1361399743 in words is "one billion, three hundred sixty-one million, three hundred ninety-nine thousand, seven hundred forty-three".