1285430386 has 4 divisors (see below), whose sum is σ = 1928145582. Its totient is φ = 642715192.

The previous prime is 1285430353. The next prime is 1285430387. The reversal of 1285430386 is 6830345821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 877996161 + 407434225 = 29631^2 + 20185^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1285430387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321357595 + ... + 321357598.

Almost surely, 2^1285430386 is an apocalyptic number.

1285430386 is a deficient number, since it is larger than the sum of its proper divisors (642715196).

1285430386 is an equidigital number, since it uses as much as digits as its factorization.

1285430386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642715195.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 1285430386 is about 35852.8992690968. The cubic root of 1285430386 is about 1087.3003319691.

The spelling of 1285430386 in words is "one billion, two hundred eighty-five million, four hundred thirty thousand, three hundred eighty-six".