1630998 has 36 divisors (see below), whose sum is σ = 3744468. Its totient is φ = 513000.

The previous prime is 1630987. The next prime is 1631023. The reversal of 1630998 is 8990361.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6373 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (104013).

2^1630998 is an apocalyptic number.

1630998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1872234).

1630998 is an abundant number, since it is smaller than the sum of its proper divisors (2113470).

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

1630998 is a wasteful number, since it uses less digits than its factorization.

1630998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1630998 is about 1277.1053206373. The cubic root of 1630998 is about 117.7112060663.

It can be divided in two parts, 1630 and 998, that added together give a triangular number (2628 = T₇₂).

The spelling of 1630998 in words is "one million, six hundred thirty thousand, nine hundred ninety-eight".