15220381 has 8 divisors (see below), whose sum is σ = 16917984. Its totient is φ = 13575120.

The previous prime is 15220379. The next prime is 15220391. The reversal of 15220381 is 18302251.

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 15220381 - 2¹ = 15220379 is a prime.

It is a super-2 number, since 2×15220381² = 463319995570322, 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 (15220391) 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, 12471 + ... + 13636.

It is an arithmetic number, because the mean of its divisors is an integer number (2114748).

Almost surely, 2^15220381 is an apocalyptic number.

15220381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15220381 is a deficient number, since it is larger than the sum of its proper divisors (1697603).

15220381 is a wasteful number, since it uses less digits than its factorization.

15220381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26171.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 15220381 is about 3901.3306704252. The cubic root of 15220381 is about 247.8231319996.

The spelling of 15220381 in words is "fifteen million, two hundred twenty thousand, three hundred eighty-one".