1381149828 has 18 divisors (see below), whose sum is σ = 3491239934. Its totient is φ = 460383264.

The previous prime is 1381149827. The next prime is 1381149863. The reversal of 1381149828 is 8289411831.

1381149828 is a `hidden beast` number, since 138 + 1 + 1 + 498 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1262949444 + 118200384 = 35538^2 + 10872^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1381149827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19182601 + ... + 19182672.

Almost surely, 2^1381149828 is an apocalyptic number.

1381149828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1381149828 is an abundant number, since it is smaller than the sum of its proper divisors (2110090106).

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

1381149828 is a wasteful number, since it uses less digits than its factorization.

1381149828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38365283 (or 38365278 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 1381149828 is about 37163.8241842790. The cubic root of 1381149828 is about 1113.6454095045.

The spelling of 1381149828 in words is "one billion, three hundred eighty-one million, one hundred forty-nine thousand, eight hundred twenty-eight".