15402081 has 8 divisors (see below), whose sum is σ = 20554240. Its totient is φ = 10258992.

The previous prime is 15402067. The next prime is 15402083. The reversal of 15402081 is 18020451.

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

It is not a de Polignac number, because 15402081 - 2⁹ = 15401569 is a prime.

It is a super-2 number, since 2×15402081² = 474448198261122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15402083) 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, 5571 + ... + 7863.

It is an arithmetic number, because the mean of its divisors is an integer number (2569280).

Almost surely, 2^15402081 is an apocalyptic number.

It is an amenable number.

15402081 is a deficient number, since it is larger than the sum of its proper divisors (5152159).

15402081 is a wasteful number, since it uses less digits than its factorization.

15402081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 15402081 is about 3924.5485090645. The cubic root of 15402081 is about 248.8053994772.

The spelling of 15402081 in words is "fifteen million, four hundred two thousand, eighty-one".