1986431425 has 24 divisors (see below), whose sum is σ = 2704951872. Its totient is φ = 1435080000.

The previous prime is 1986431387. The next prime is 1986431449. The reversal of 1986431425 is 5241346891.

It is not a de Polignac number, because 1986431425 - 2²⁹ = 1449560513 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17607 + ... + 65443.

It is an arithmetic number, because the mean of its divisors is an integer number (112706328).

Almost surely, 2^1986431425 is an apocalyptic number.

It is an amenable number.

1986431425 is a deficient number, since it is larger than the sum of its proper divisors (718520447).

1986431425 is a wasteful number, since it uses less digits than its factorization.

1986431425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48009 (or 48004 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 1986431425 is about 44569.4000969275. The cubic root of 1986431425 is about 1257.0653599752.

The spelling of 1986431425 in words is "one billion, nine hundred eighty-six million, four hundred thirty-one thousand, four hundred twenty-five".