1381988 has 12 divisors (see below), whose sum is σ = 2470272. Its totient is φ = 676200.

The previous prime is 1381979. The next prime is 1381993. The reversal of 1381988 is 8891831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3488 + ... + 3863.

It is an arithmetic number, because the mean of its divisors is an integer number (205856).

2^1381988 is an apocalyptic number.

It is an amenable number.

1381988 is a deficient number, since it is larger than the sum of its proper divisors (1088284).

1381988 is a wasteful number, since it uses less digits than its factorization.

1381988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7402 (or 7400 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 1381988 is about 1175.5798569217. The cubic root of 1381988 is about 111.3870641560.

The spelling of 1381988 in words is "one million, three hundred eighty-one thousand, nine hundred eighty-eight".