1902985439 has 4 divisors (see below), whose sum is σ = 1949399760. Its totient is φ = 1856571120.

The previous prime is 1902985433. The next prime is 1902985453. The reversal of 1902985439 is 9345892091.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9345892091 = 97 ⋅96349403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1902985439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1902985433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23207099 + ... + 23207180.

It is an arithmetic number, because the mean of its divisors is an integer number (487349940).

Almost surely, 2^1902985439 is an apocalyptic number.

1902985439 is a deficient number, since it is larger than the sum of its proper divisors (46414321).

1902985439 is an equidigital number, since it uses as much as digits as its factorization.

1902985439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46414320.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1902985439 is about 43623.2213276370. The cubic root of 1902985439 is about 1239.2107010836.

The spelling of 1902985439 in words is "one billion, nine hundred two million, nine hundred eighty-five thousand, four hundred thirty-nine".