1630638 has 16 divisors (see below), whose sum is σ = 3623760. Its totient is φ = 543528.

The previous prime is 1630633. The next prime is 1630663. The reversal of 1630638 is 8360361.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15045 + ... + 15152.

It is an arithmetic number, because the mean of its divisors is an integer number (226485).

2^1630638 is an apocalyptic number.

1630638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1630638 is an abundant number, since it is smaller than the sum of its proper divisors (1993122).

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

1630638 is a wasteful number, since it uses less digits than its factorization.

1630638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30208 (or 30202 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1630638 is about 1276.9643691192. The cubic root of 1630638 is about 117.7025448759.

Adding to 1630638 its reverse (8360361), we get a palindrome (9990999).

The spelling of 1630638 in words is "one million, six hundred thirty thousand, six hundred thirty-eight".