387106721 has 8 divisors (see below), whose sum is σ = 404170944. Its totient is φ = 370062000.

The previous prime is 387106679. The next prime is 387106723. The reversal of 387106721 is 127601783.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 387106721 - 2²⁶ = 319997857 is a prime.

It is a super-2 number, since 2×387106721² = 299703226886743682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (387106723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48035 + ... + 55511.

It is an arithmetic number, because the mean of its divisors is an integer number (50521368).

Almost surely, 2^387106721 is an apocalyptic number.

It is an amenable number.

387106721 is a deficient number, since it is larger than the sum of its proper divisors (17064223).

387106721 is a wasteful number, since it uses less digits than its factorization.

387106721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9751.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 387106721 is about 19675.0278525851. The cubic root of 387106721 is about 728.8031435638.

The spelling of 387106721 in words is "three hundred eighty-seven million, one hundred six thousand, seven hundred twenty-one".