1021394818 has 16 divisors (see below), whose sum is σ = 1615965120. Its totient is φ = 482847696.

The previous prime is 1021394813. The next prime is 1021394831. The reversal of 1021394818 is 8184931201.

It is not an unprimeable number, because it can be changed into a prime (1021394813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7605 + ... + 45832.

It is an arithmetic number, because the mean of its divisors is an integer number (100997820).

Almost surely, 2^1021394818 is an apocalyptic number.

1021394818 is a deficient number, since it is larger than the sum of its proper divisors (594570302).

1021394818 is a wasteful number, since it uses less digits than its factorization.

1021394818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53961.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1021394818 is about 31959.2681080152. The cubic root of 1021394818 is about 1007.0813422267.

The spelling of 1021394818 in words is "one billion, twenty-one million, three hundred ninety-four thousand, eight hundred eighteen".