387740993 has 4 divisors (see below), whose sum is σ = 393528240. Its totient is φ = 381953748.

The previous prime is 387740989. The next prime is 387741001. The reversal of 387740993 is 399047783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 387740993 - 2² = 387740989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387740893) 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, 2893523 + ... + 2893656.

It is an arithmetic number, because the mean of its divisors is an integer number (98382060).

Almost surely, 2^387740993 is an apocalyptic number.

It is an amenable number.

387740993 is a deficient number, since it is larger than the sum of its proper divisors (5787247).

387740993 is an equidigital number, since it uses as much as digits as its factorization.

387740993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787246.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 387740993 is about 19691.1399619220. The cubic root of 387740993 is about 729.2009728636.

The spelling of 387740993 in words is "three hundred eighty-seven million, seven hundred forty thousand, nine hundred ninety-three".