381697439 has 4 divisors (see below), whose sum is σ = 392013624. Its totient is φ = 371381256.

The previous prime is 381697409. The next prime is 381697469. The reversal of 381697439 is 934796183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934796183 = 3163 ⋅295541.

It is an interprime number because it is at equal distance from previous prime (381697409) and next prime (381697469).

It is a cyclic number.

It is not a de Polignac number, because 381697439 - 2²⁴ = 364920223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381697409) 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, 5158037 + ... + 5158110.

It is an arithmetic number, because the mean of its divisors is an integer number (98003406).

Almost surely, 2^381697439 is an apocalyptic number.

381697439 is a deficient number, since it is larger than the sum of its proper divisors (10316185).

381697439 is a wasteful number, since it uses less digits than its factorization.

381697439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316184.

The product of its digits is 979776, while the sum is 50.

The square root of 381697439 is about 19537.0785687113. The cubic root of 381697439 is about 725.3925351136.

The spelling of 381697439 in words is "three hundred eighty-one million, six hundred ninety-seven thousand, four hundred thirty-nine".