387240569 has 4 divisors (see below), whose sum is σ = 410019444. Its totient is φ = 364461696.

The previous prime is 387240559. The next prime is 387240589. The reversal of 387240569 is 965042783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 965042783 = 317 ⋅3044299.

It can be written as a sum of positive squares in 2 ways, for example, as 138768400 + 248472169 = 11780^2 + 15763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387240569 is a prime.

It is a super-2 number, since 2×387240569² = 299910516558887522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387240559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11389412 + ... + 11389445.

It is an arithmetic number, because the mean of its divisors is an integer number (102504861).

Almost surely, 2^387240569 is an apocalyptic number.

It is an amenable number.

387240569 is a deficient number, since it is larger than the sum of its proper divisors (22778875).

387240569 is a wasteful number, since it uses less digits than its factorization.

387240569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22778874.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 387240569 is about 19678.4290277451. The cubic root of 387240569 is about 728.8871321187.

The spelling of 387240569 in words is "three hundred eighty-seven million, two hundred forty thousand, five hundred sixty-nine".