387121649 has 4 divisors (see below), whose sum is σ = 387212964. Its totient is φ = 387030336.

The previous prime is 387121633. The next prime is 387121661. The reversal of 387121649 is 946121783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207561649 + 179560000 = 14407^2 + 13400^2 .

It is a cyclic number.

It is not a de Polignac number, because 387121649 - 2⁴ = 387121633 is a prime.

It is a super-2 number, since 2×387121649² = 299726342248958402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387121849) 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, 38972 + ... + 47885.

It is an arithmetic number, because the mean of its divisors is an integer number (96803241).

Almost surely, 2^387121649 is an apocalyptic number.

It is an amenable number.

387121649 is a deficient number, since it is larger than the sum of its proper divisors (91315).

387121649 is an equidigital number, since it uses as much as digits as its factorization.

387121649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91314.

The product of its digits is 72576, while the sum is 41.

The square root of 387121649 is about 19675.4072130668. The cubic root of 387121649 is about 728.8125117241.

The spelling of 387121649 in words is "three hundred eighty-seven million, one hundred twenty-one thousand, six hundred forty-nine".