15380381 has 8 divisors (see below), whose sum is σ = 15631704. Its totient is φ = 15131200.

The previous prime is 15380377. The next prime is 15380383. The reversal of 15380381 is 18308351.

It can be written as a sum of positive squares in 4 ways, for example, as 7022500 + 8357881 = 2650^2 + 2891^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15380381 - 2² = 15380377 is a prime.

It is a super-2 number, since 2×15380381² = 473112239410322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15380383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19511 + ... + 20283.

It is an arithmetic number, because the mean of its divisors is an integer number (1953963).

Almost surely, 2^15380381 is an apocalyptic number.

It is an amenable number.

15380381 is a deficient number, since it is larger than the sum of its proper divisors (251323).

15380381 is a wasteful number, since it uses less digits than its factorization.

15380381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 15380381 is about 3921.7828853724. The cubic root of 15380381 is about 248.6884972061.

The spelling of 15380381 in words is "fifteen million, three hundred eighty thousand, three hundred eighty-one".