380106721 has 4 divisors (see below), whose sum is σ = 380473600. Its totient is φ = 379739844.

The previous prime is 380106707. The next prime is 380106731. The reversal of 380106721 is 127601083.

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 380106721 - 2¹⁹ = 379582433 is a prime.

It is a super-2 number, since 2×380106721² = 288962238698743682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 380106721.

It is not an unprimeable number, because it can be changed into a prime (380106731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181881 + ... + 183958.

It is an arithmetic number, because the mean of its divisors is an integer number (95118400).

Almost surely, 2^380106721 is an apocalyptic number.

It is an amenable number.

380106721 is a deficient number, since it is larger than the sum of its proper divisors (366879).

380106721 is a wasteful number, since it uses less digits than its factorization.

380106721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366878.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 380106721 is about 19496.3258333461. The cubic root of 380106721 is about 724.3834447430.

The spelling of 380106721 in words is "three hundred eighty million, one hundred six thousand, seven hundred twenty-one".