1649688430 has 24 divisors (see below), whose sum is σ = 3215431512. Its totient is φ = 609115104.

The previous prime is 1649688419. The next prime is 1649688437. The reversal of 1649688430 is 348869461.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649688437) 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 11 ways as a sum of consecutive naturals, for example, 486384 + ... + 489763.

It is an arithmetic number, because the mean of its divisors is an integer number (133976313).

Almost surely, 2^1649688430 is an apocalyptic number.

1649688430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1649688430 is a deficient number, since it is larger than the sum of its proper divisors (1565743082).

1649688430 is a wasteful number, since it uses less digits than its factorization.

1649688430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976180 (or 976167 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 1649688430 is about 40616.3566805296. The cubic root of 1649688430 is about 1181.5913676848.

The spelling of 1649688430 in words is "one billion, six hundred forty-nine million, six hundred eighty-eight thousand, four hundred thirty".