387138949 has 4 divisors (see below), whose sum is σ = 387882540. Its totient is φ = 386395360.

The previous prime is 387138937. The next prime is 387138989. The reversal of 387138949 is 949831783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949831783 = 113 ⋅8405591.

It can be written as a sum of positive squares in 2 ways, for example, as 295324225 + 91814724 = 17185^2 + 9582^2 .

It is a cyclic number.

It is not a de Polignac number, because 387138949 - 2¹⁹ = 386614661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387138896 and 387138905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387138919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371014 + ... + 372055.

It is an arithmetic number, because the mean of its divisors is an integer number (96970635).

Almost surely, 2^387138949 is an apocalyptic number.

It is an amenable number.

387138949 is a deficient number, since it is larger than the sum of its proper divisors (743591).

387138949 is an equidigital number, since it uses as much as digits as its factorization.

387138949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743590.

The product of its digits is 1306368, while the sum is 52.

The square root of 387138949 is about 19675.8468432746. The cubic root of 387138949 is about 728.8233681467.

The spelling of 387138949 in words is "three hundred eighty-seven million, one hundred thirty-eight thousand, nine hundred forty-nine".