1000391816 has 16 divisors (see below), whose sum is σ = 1876079040. Its totient is φ = 500104080.

The previous prime is 1000391813. The next prime is 1000391839. The reversal of 1000391816 is 6181930001.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1000391813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64061 + ... + 78131.

It is an arithmetic number, because the mean of its divisors is an integer number (117254940).

Almost surely, 2^1000391816 is an apocalyptic number.

It is an amenable number.

1000391816 is a deficient number, since it is larger than the sum of its proper divisors (875687224).

1000391816 is a wasteful number, since it uses less digits than its factorization.

1000391816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22964 (or 22960 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1000391816 is about 31628.9711498809. The cubic root of 1000391816 is about 1000.1305882793.

The spelling of 1000391816 in words is "one billion, three hundred ninety-one thousand, eight hundred sixteen".