1381821916 has 6 divisors (see below), whose sum is σ = 2418188360. Its totient is φ = 690910956.

The previous prime is 1381821913. The next prime is 1381821919. The reversal of 1381821916 is 6191281831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1381821913) and next prime (1381821919).

It is a super-2 number, since 2×1381821916² = 3818863615075822112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381821913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172727736 + ... + 172727743.

Almost surely, 2^1381821916 is an apocalyptic number.

It is an amenable number.

1381821916 is a deficient number, since it is larger than the sum of its proper divisors (1036366444).

1381821916 is a wasteful number, since it uses less digits than its factorization.

1381821916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345455483 (or 345455481 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 1381821916 is about 37172.8653186703. The cubic root of 1381821916 is about 1113.8260190054.

The spelling of 1381821916 in words is "one billion, three hundred eighty-one million, eight hundred twenty-one thousand, nine hundred sixteen".