379191721 has 16 divisors (see below), whose sum is σ = 416335360. Its totient is φ = 344010240.

The previous prime is 379191713. The next prime is 379191737. The reversal of 379191721 is 127191973.

It is a cyclic number.

It is not a de Polignac number, because 379191721 - 2³ = 379191713 is a prime.

It is a super-2 number, since 2×379191721² = 287572722549883682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (379191781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53815 + ... + 60451.

It is an arithmetic number, because the mean of its divisors is an integer number (26020960).

Almost surely, 2^379191721 is an apocalyptic number.

379191721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

379191721 is a deficient number, since it is larger than the sum of its proper divisors (37143639).

379191721 is a wasteful number, since it uses less digits than its factorization.

379191721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784.

The product of its digits is 23814, while the sum is 40.

The square root of 379191721 is about 19472.8457345094. The cubic root of 379191721 is about 723.8017279327.

The spelling of 379191721 in words is "three hundred seventy-nine million, one hundred ninety-one thousand, seven hundred twenty-one".