248921978 has 4 divisors (see below), whose sum is σ = 373382970. Its totient is φ = 124460988.

The previous prime is 248921941. The next prime is 248921999. The reversal of 248921978 is 879129842.

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., 145757329 + 103164649 = 12073^2 + 10157^2 .

It is a super-3 number, since 3×248921978³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62230493 + ... + 62230496.

Almost surely, 2^248921978 is an apocalyptic number.

248921978 is a deficient number, since it is larger than the sum of its proper divisors (124460992).

248921978 is a wasteful number, since it uses less digits than its factorization.

248921978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124460991.

The product of its digits is 580608, while the sum is 50.

The square root of 248921978 is about 15777.2614226931. The cubic root of 248921978 is about 629.0537385749.

The spelling of 248921978 in words is "two hundred forty-eight million, nine hundred twenty-one thousand, nine hundred seventy-eight".