381721327 has 16 divisors (see below), whose sum is σ = 419328000. Its totient is φ = 345330144.

The previous prime is 381721309. The next prime is 381721339. The reversal of 381721327 is 723127183.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 381721327 - 2⁷ = 381721199 is a prime.

It is a super-2 number, since 2×381721327² = 291422342973281858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 381721292 and 381721301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381721397) 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, 366874 + ... + 367912.

It is an arithmetic number, because the mean of its divisors is an integer number (26208000).

Almost surely, 2^381721327 is an apocalyptic number.

381721327 is a deficient number, since it is larger than the sum of its proper divisors (37606673).

381721327 is a wasteful number, since it uses less digits than its factorization.

381721327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its digits is 14112, while the sum is 34.

The square root of 381721327 is about 19537.6899095057. The cubic root of 381721327 is about 725.4076673568.

The spelling of 381721327 in words is "three hundred eighty-one million, seven hundred twenty-one thousand, three hundred twenty-seven".