1978229386 has 16 divisors (see below), whose sum is σ = 3391827840. Its totient is φ = 847668240.

The previous prime is 1978229339. The next prime is 1978229411. The reversal of 1978229386 is 6839228791.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135595 + ... + 149473.

It is an arithmetic number, because the mean of its divisors is an integer number (211989240).

Almost surely, 2^1978229386 is an apocalyptic number.

1978229386 is a deficient number, since it is larger than the sum of its proper divisors (1413598454).

1978229386 is a wasteful number, since it uses less digits than its factorization.

1978229386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24069.

The product of its digits is 2612736, while the sum is 55.

The square root of 1978229386 is about 44477.2906773783. The cubic root of 1978229386 is about 1255.3328188273.

The spelling of 1978229386 in words is "one billion, nine hundred seventy-eight million, two hundred twenty-nine thousand, three hundred eighty-six".