1381989 has 8 divisors (see below), whose sum is σ = 2105920. Its totient is φ = 789696.

The previous prime is 1381979. The next prime is 1381993. The reversal of 1381989 is 9891831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1381989 - 2⁴ = 1381973 is a prime.

It is a super-2 number, since 2×1381989² = 3819787192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32884 + ... + 32925.

It is an arithmetic number, because the mean of its divisors is an integer number (263240).

2^1381989 is an apocalyptic number.

It is an amenable number.

1381989 is a deficient number, since it is larger than the sum of its proper divisors (723931).

1381989 is an equidigital number, since it uses as much as digits as its factorization.

1381989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65819.

The product of its digits is 15552, while the sum is 39.

The square root of 1381989 is about 1175.5802822436. The cubic root of 1381989 is about 111.3870910223.

The spelling of 1381989 in words is "one million, three hundred eighty-one thousand, nine hundred eighty-nine".