1629990 has 32 divisors (see below), whose sum is σ = 4347360. Its totient is φ = 434592.

The previous prime is 1629983. The next prime is 1629997. The reversal of 1629990 is 999261.

It is an interprime number because it is at equal distance from previous prime (1629983) and next prime (1629997).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1629997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2749 + ... + 3288.

It is an arithmetic number, because the mean of its divisors is an integer number (135855).

2^1629990 is an apocalyptic number.

1629990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1629990 is an abundant number, since it is smaller than the sum of its proper divisors (2717370).

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

1629990 is a wasteful number, since it uses less digits than its factorization.

1629990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6053 (or 6047 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 1629990 is about 1276.7106171721. The cubic root of 1629990 is about 117.6869515204.

The spelling of 1629990 in words is "one million, six hundred twenty-nine thousand, nine hundred ninety".