994158478 has 4 divisors (see below), whose sum is σ = 1491237720. Its totient is φ = 497079238.

The previous prime is 994158469. The next prime is 994158551. The reversal of 994158478 is 874851499.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874851499 = 2297 ⋅380867.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248539618 + ... + 248539621.

It is an arithmetic number, because the mean of its divisors is an integer number (372809430).

Almost surely, 2^994158478 is an apocalyptic number.

994158478 is a deficient number, since it is larger than the sum of its proper divisors (497079242).

994158478 is a wasteful number, since it uses less digits than its factorization.

994158478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497079241.

The product of its digits is 2903040, while the sum is 55.

The square root of 994158478 is about 31530.2787491643. The cubic root of 994158478 is about 998.0490221608.

The spelling of 994158478 in words is "nine hundred ninety-four million, one hundred fifty-eight thousand, four hundred seventy-eight".