1381689 has 6 divisors (see below), whose sum is σ = 1995786. Its totient is φ = 921120.

The previous prime is 1381649. The next prime is 1381693. The reversal of 1381689 is 9861831.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 189225 = 1092^2 + 435^2 .

It is not a de Polignac number, because 1381689 - 2¹¹ = 1379641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76752 + ... + 76769.

It is an arithmetic number, because the mean of its divisors is an integer number (332631).

2^1381689 is an apocalyptic number.

It is an amenable number.

1381689 is a deficient number, since it is larger than the sum of its proper divisors (614097).

1381689 is a wasteful number, since it uses less digits than its factorization.

1381689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153527 (or 153524 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1381689 is about 1175.4526787583. The cubic root of 1381689 is about 111.3790305275.

The spelling of 1381689 in words is "one million, three hundred eighty-one thousand, six hundred eighty-nine".