1629440906 has 8 divisors (see below), whose sum is σ = 2484229764. Its totient is φ = 801364320.

The previous prime is 1629440899. The next prime is 1629440929. The reversal of 1629440906 is 6090449261.

It can be written as a sum of positive squares in 2 ways, for example, as 1623364681 + 6076225 = 40291^2 + 2465^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1629440906² = 5310155332292201672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6677915 + ... + 6678158.

Almost surely, 2^1629440906 is an apocalyptic number.

1629440906 is a deficient number, since it is larger than the sum of its proper divisors (854788858).

1629440906 is a wasteful number, since it uses less digits than its factorization.

1629440906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13356136.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 1629440906 is about 40366.3338191617. Note that the first 3 decimals coincide. The cubic root of 1629440906 is about 1176.7373498598.

The spelling of 1629440906 in words is "one billion, six hundred twenty-nine million, four hundred forty thousand, nine hundred six".