1381709 has 12 divisors (see below), whose sum is σ = 1679904. Its totient is φ = 1113024.

The previous prime is 1381697. The next prime is 1381727. The reversal of 1381709 is 9071831.

It is not a de Polignac number, because 1381709 - 2⁴ = 1381693 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 (1381739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1682 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (139992).

2^1381709 is an apocalyptic number.

It is an amenable number.

1381709 is a deficient number, since it is larger than the sum of its proper divisors (298195).

1381709 is an equidigital number, since it uses as much as digits as its factorization.

1381709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1381709 is about 1175.4611860883. The cubic root of 1381709 is about 111.3795679301.

The spelling of 1381709 in words is "one million, three hundred eighty-one thousand, seven hundred nine".