381694369 has 9 divisors (see below), whose sum is σ = 444170961. Its totient is φ = 327049380.

The previous prime is 381694349. The next prime is 381694373. The reversal of 381694369 is 963496183.

The square root of 381694369 is 19537.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 381694369 - 2⁵ = 381694337 is a prime.

It is a super-2 number, since 2×381694369² = 291381182652616322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381694349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 135364 + ... + 138154.

It is an arithmetic number, because the mean of its divisors is an integer number (49352329).

Almost surely, 2^381694369 is an apocalyptic number.

381694369 is the 19537-th square number.

381694369 is the 9769-th centered octagonal number.

It is an amenable number.

381694369 is a deficient number, since it is larger than the sum of its proper divisors (62476592).

381694369 is an frugal number, since it uses more digits than its factorization.

381694369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596 (or 2798 counting only the distinct ones).

The product of its digits is 839808, while the sum is 49.

The cubic root of 381694369 is about 725.3905903262.

Multiplying 381694369 by its sum of digits (49), we get a square (18703024081 = 136759²).

381694369 divided by its sum of digits (49) gives a square (7789681 = 2791²).

The spelling of 381694369 in words is "three hundred eighty-one million, six hundred ninety-four thousand, three hundred sixty-nine".