387071721 has 12 divisors (see below), whose sum is σ = 559745472. Its totient is φ = 257751576.

The previous prime is 387071719. The next prime is 387071723. The reversal of 387071721 is 127170783.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (387071719) and next prime (387071723).

It is not a de Polignac number, because 387071721 - 2¹ = 387071719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387071723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16261 + ... + 32226.

It is an arithmetic number, because the mean of its divisors is an integer number (46645456).

Almost surely, 2^387071721 is an apocalyptic number.

It is an amenable number.

387071721 is a deficient number, since it is larger than the sum of its proper divisors (172673751).

387071721 is a wasteful number, since it uses less digits than its factorization.

387071721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49380 (or 49377 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 387071721 is about 19674.1383801172. The cubic root of 387071721 is about 728.7811781492.

The spelling of 387071721 in words is "three hundred eighty-seven million, seventy-one thousand, seven hundred twenty-one".