1380739 has 4 divisors (see below), whose sum is σ = 1388160. Its totient is φ = 1373320.

The previous prime is 1380727. The next prime is 1380763. The reversal of 1380739 is 9370831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9370831 = 859 ⋅10909.

It is a cyclic number.

It is not a de Polignac number, because 1380739 - 2⁵ = 1380707 is a prime.

It is a super-2 number, since 2×1380739² = 3812880372242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1380739 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1380739.

It is not an unprimeable number, because it can be changed into a prime (1380779) 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, 3424 + ... + 3805.

It is an arithmetic number, because the mean of its divisors is an integer number (347040).

2^1380739 is an apocalyptic number.

1380739 is a deficient number, since it is larger than the sum of its proper divisors (7421).

1380739 is an equidigital number, since it uses as much as digits as its factorization.

1380739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1380739 is about 1175.0485096369. The cubic root of 1380739 is about 111.3534979273.

The spelling of 1380739 in words is "one million, three hundred eighty thousand, seven hundred thirty-nine".