499978 has 4 divisors (see below), whose sum is σ = 749970. Its totient is φ = 249988.

The previous prime is 499973. The next prime is 499979. The reversal of 499978 is 879994.

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

It can be written as a sum of positive squares in only one way, i.e., 466489 + 33489 = 683^2 + 183^2 .

It is not an unprimeable number, because it can be changed into a prime (499973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124993 + ... + 124996.

2⁴⁹⁹⁹⁷⁸ is an apocalyptic number.

499978 is a deficient number, since it is larger than the sum of its proper divisors (249992).

499978 is a wasteful number, since it uses less digits than its factorization.

499978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249991.

The product of its digits is 163296, while the sum is 46.

The square root of 499978 is about 707.0912246662. The cubic root of 499978 is about 79.3688884872.

It can be divided in two parts, 49997 and 8, that added together give a palindrome (50005).

The spelling of 499978 in words is "four hundred ninety-nine thousand, nine hundred seventy-eight".