379997781 has 4 divisors (see below), whose sum is σ = 506663712. Its totient is φ = 253331852.

The previous prime is 379997771. The next prime is 379997809. The reversal of 379997781 is 187799973.

It is a happy number.

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 379997781 - 2⁵ = 379997749 is a prime.

It is a super-2 number, since 2×379997781² = 288796627129847922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (379997771) 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, 63332961 + ... + 63332966.

It is an arithmetic number, because the mean of its divisors is an integer number (126665928).

Almost surely, 2^379997781 is an apocalyptic number.

It is an amenable number.

379997781 is a deficient number, since it is larger than the sum of its proper divisors (126665931).

379997781 is a wasteful number, since it uses less digits than its factorization.

379997781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126665930.

The product of its digits is 6001128, while the sum is 60.

The square root of 379997781 is about 19493.5317733858. The cubic root of 379997781 is about 724.3142344674.

The spelling of 379997781 in words is "three hundred seventy-nine million, nine hundred ninety-seven thousand, seven hundred eighty-one".