1381311492 has 48 divisors (see below), whose sum is σ = 3522500352. Its totient is φ = 417813280.

The previous prime is 1381311487. The next prime is 1381311509. The reversal of 1381311492 is 2941131831.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65023 + ... + 83609.

It is an arithmetic number, because the mean of its divisors is an integer number (73385424).

Almost surely, 2^1381311492 is an apocalyptic number.

1381311492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1381311492 is an abundant number, since it is smaller than the sum of its proper divisors (2141188860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381311492 is a wasteful number, since it uses less digits than its factorization.

1381311492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19168 (or 19166 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1381311492 is about 37165.9991389980. Note that the first 3 decimals coincide. The cubic root of 1381311492 is about 1113.6888586519.

The spelling of 1381311492 in words is "one billion, three hundred eighty-one million, three hundred eleven thousand, four hundred ninety-two".