1986431426 has 16 divisors (see below), whose sum is σ = 3438374784. Its totient is φ = 843061824.

The previous prime is 1986431387. The next prime is 1986431449. The reversal of 1986431426 is 6241346891.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 687335 + ... + 690218.

It is an arithmetic number, because the mean of its divisors is an integer number (214898424).

Almost surely, 2^1986431426 is an apocalyptic number.

1986431426 is a deficient number, since it is larger than the sum of its proper divisors (1451943358).

1986431426 is a wasteful number, since it uses less digits than its factorization.

1986431426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377665.

The product of its digits is 248832, while the sum is 44.

The square root of 1986431426 is about 44569.4001081459. The cubic root of 1986431426 is about 1257.0653601861.

The spelling of 1986431426 in words is "one billion, nine hundred eighty-six million, four hundred thirty-one thousand, four hundred twenty-six".