1381964 has 12 divisors (see below), whose sum is σ = 2560824. Its totient is φ = 650304.

The previous prime is 1381921. The next prime is 1381967. The reversal of 1381964 is 4691831.

It is a happy number.

It is an Ulam number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1381964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381967) 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, 10094 + ... + 10229.

It is an arithmetic number, because the mean of its divisors is an integer number (213402).

2^1381964 is an apocalyptic number.

It is an amenable number.

1381964 is a deficient number, since it is larger than the sum of its proper divisors (1178860).

1381964 is a wasteful number, since it uses less digits than its factorization.

1381964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20344 (or 20342 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1381964 is about 1175.5696491489. The cubic root of 1381964 is about 111.3864193590.

The spelling of 1381964 in words is "one million, three hundred eighty-one thousand, nine hundred sixty-four".