15384981 has 4 divisors (see below), whose sum is σ = 20513312. Its totient is φ = 10256652.

The previous prime is 15384977. The next prime is 15384989. The reversal of 15384981 is 18948351.

15384981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18948351 = 3 ⋅6316117.

It is not a de Polignac number, because 15384981 - 2² = 15384977 is a prime.

It is a super-2 number, since 2×15384981² = 473395280740722, 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 (15384989) 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, 2564161 + ... + 2564166.

It is an arithmetic number, because the mean of its divisors is an integer number (5128328).

Almost surely, 2^15384981 is an apocalyptic number.

It is an amenable number.

15384981 is a deficient number, since it is larger than the sum of its proper divisors (5128331).

15384981 is an equidigital number, since it uses as much as digits as its factorization.

15384981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128330.

The product of its digits is 34560, while the sum is 39.

The square root of 15384981 is about 3922.3693094863. The cubic root of 15384981 is about 248.7132875123.

The spelling of 15384981 in words is "fifteen million, three hundred eighty-four thousand, nine hundred eighty-one".