1381950009 has 96 divisors (see below), whose sum is σ = 2533939200. Its totient is φ = 713940480.

The previous prime is 1381950007. The next prime is 1381950013. The reversal of 1381950009 is 9000591831.

It is a happy number.

1381950009 is a `hidden beast` number, since 138 + 19 + 500 + 0 + 9 = 666.

It is not a de Polignac number, because 1381950009 - 2¹ = 1381950007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381950001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 734532 + ... + 736410.

It is an arithmetic number, because the mean of its divisors is an integer number (26395200).

Almost surely, 2^1381950009 is an apocalyptic number.

1381950009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1381950009 is a deficient number, since it is larger than the sum of its proper divisors (1151989191).

1381950009 is a wasteful number, since it uses less digits than its factorization.

1381950009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1381950009 is about 37174.5882156077. The cubic root of 1381950009 is about 1113.8604346578.

The spelling of 1381950009 in words is "one billion, three hundred eighty-one million, nine hundred fifty thousand, nine".