1351998 has 16 divisors (see below), whose sum is σ = 3004560. Its totient is φ = 450648.

The previous prime is 1351997. The next prime is 1352069. The reversal of 1351998 is 8991531.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12465 + ... + 12572.

It is an arithmetic number, because the mean of its divisors is an integer number (187785).

2^1351998 is an apocalyptic number.

1351998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1351998 is an abundant number, since it is smaller than the sum of its proper divisors (1652562).

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

1351998 is a wasteful number, since it uses less digits than its factorization.

1351998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25048 (or 25042 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1351998 is about 1162.7544882734. The cubic root of 1351998 is about 110.5754417491.

The spelling of 1351998 in words is "one million, three hundred fifty-one thousand, nine hundred ninety-eight".