1998370 has 32 divisors (see below), whose sum is σ = 4038336. Its totient is φ = 705600.

The previous prime is 1998349. The next prime is 1998371. The reversal of 1998370 is 738991.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (1998371) 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, 3825 + ... + 4315.

It is an arithmetic number, because the mean of its divisors is an integer number (126198).

2^1998370 is an apocalyptic number.

1998370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998370 is an abundant number, since it is smaller than the sum of its proper divisors (2039966).

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

1998370 is a wasteful number, since it uses less digits than its factorization.

1998370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1998370 is about 1413.6371528791. The cubic root of 1998370 is about 125.9578678315.

It can be divided in two parts, 19 and 98370, that added together give a palindrome (98389).

The spelling of 1998370 in words is "one million, nine hundred ninety-eight thousand, three hundred seventy".