915478638 has 8 divisors (see below), whose sum is σ = 1830957288. Its totient is φ = 305159544.

The previous prime is 915478631. The next prime is 915478657. The reversal of 915478638 is 836874519.

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

915478638 is an admirable number.

It is a super-2 number, since 2×915478638² = 1676202273268670088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915478631) 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, 76289881 + ... + 76289892.

It is an arithmetic number, because the mean of its divisors is an integer number (228869661).

Almost surely, 2^915478638 is an apocalyptic number.

915478638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

915478638 is a wasteful number, since it uses less digits than its factorization.

915478638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152579778.

The product of its digits is 1451520, while the sum is 51.

The square root of 915478638 is about 30256.8775322240. The cubic root of 915478638 is about 970.9929386661.

The spelling of 915478638 in words is "nine hundred fifteen million, four hundred seventy-eight thousand, six hundred thirty-eight".