1640984250 has 32 divisors (see below), whose sum is σ = 4095898560. Its totient is φ = 437595600.

The previous prime is 1640984239. The next prime is 1640984263. The reversal of 1640984250 is 524890461.

It is a junction number, because it is equal to n+sod(n) for n = 1640984199 and 1640984208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1093240 + ... + 1094739.

It is an arithmetic number, because the mean of its divisors is an integer number (127996830).

Almost surely, 2^1640984250 is an apocalyptic number.

1640984250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640984250 is an abundant number, since it is smaller than the sum of its proper divisors (2454914310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640984250 is a wasteful number, since it uses less digits than its factorization.

1640984250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187999 (or 2187989 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1640984250 is about 40509.0638005867. The cubic root of 1640984250 is about 1179.5095754789.

The spelling of 1640984250 in words is "one billion, six hundred forty million, nine hundred eighty-four thousand, two hundred fifty".