915978214 has 4 divisors (see below), whose sum is σ = 1373967324. Its totient is φ = 457989106.

The previous prime is 915978211. The next prime is 915978223. The reversal of 915978214 is 412879519.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915978211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228994552 + ... + 228994555.

It is an arithmetic number, because the mean of its divisors is an integer number (343491831).

Almost surely, 2^915978214 is an apocalyptic number.

915978214 is a deficient number, since it is larger than the sum of its proper divisors (457989110).

915978214 is a wasteful number, since it uses less digits than its factorization.

915978214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457989109.

The product of its digits is 181440, while the sum is 46.

The square root of 915978214 is about 30265.1319838523. The cubic root of 915978214 is about 971.1695299187.

The spelling of 915978214 in words is "nine hundred fifteen million, nine hundred seventy-eight thousand, two hundred fourteen".