1373729 has 4 divisors (see below), whose sum is σ = 1569984. Its totient is φ = 1177476.

The previous prime is 1373717. The next prime is 1373761. The reversal of 1373729 is 9273731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9273731 = 79 ⋅117389.

It is a cyclic number.

It is not a de Polignac number, because 1373729 - 2⁸ = 1373473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1373695 and 1373704.

It is not an unprimeable number, because it can be changed into a prime (1373789) 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, 98117 + ... + 98130.

It is an arithmetic number, because the mean of its divisors is an integer number (392496).

2^1373729 is an apocalyptic number.

It is an amenable number.

1373729 is a deficient number, since it is larger than the sum of its proper divisors (196255).

1373729 is an equidigital number, since it uses as much as digits as its factorization.

1373729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196254.

The product of its digits is 7938, while the sum is 32.

The square root of 1373729 is about 1172.0618584358. The cubic root of 1373729 is about 111.1647311939.

The spelling of 1373729 in words is "one million, three hundred seventy-three thousand, seven hundred twenty-nine".