1000938778 has 48 divisors (see below), whose sum is σ = 1795828320. Its totient is φ = 416967264.

The previous prime is 1000938773. The next prime is 1000938787. The reversal of 1000938778 is 8778390001.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1000938773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1133125 + ... + 1134007.

It is an arithmetic number, because the mean of its divisors is an integer number (37413090).

Almost surely, 2^1000938778 is an apocalyptic number.

1000938778 is a deficient number, since it is larger than the sum of its proper divisors (794889542).

1000938778 is a wasteful number, since it uses less digits than its factorization.

1000938778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 1000938778 is about 31637.6165031438. The cubic root of 1000938778 is about 1000.3128281284.

The spelling of 1000938778 in words is "one billion, nine hundred thirty-eight thousand, seven hundred seventy-eight".