1629453988 has 6 divisors (see below), whose sum is σ = 2851544486. Its totient is φ = 814726992.

The previous prime is 1629453979. The next prime is 1629454007. The reversal of 1629453988 is 8893549261.

It can be written as a sum of positive squares in only one way, i.e., 1597441024 + 32012964 = 39968^2 + 5658^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 203681745 + ... + 203681752.

Almost surely, 2^1629453988 is an apocalyptic number.

It is an amenable number.

1629453988 is a deficient number, since it is larger than the sum of its proper divisors (1222090498).

1629453988 is a wasteful number, since it uses less digits than its factorization.

1629453988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407363501 (or 407363499 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 55.

The square root of 1629453988 is about 40366.4958598093. The cubic root of 1629453988 is about 1176.7404990047.

The spelling of 1629453988 in words is "one billion, six hundred twenty-nine million, four hundred fifty-three thousand, nine hundred eighty-eight".