1211598 has 32 divisors (see below), whose sum is σ = 2735520. Its totient is φ = 402408.

The previous prime is 1211597. The next prime is 1211599. The reversal of 1211598 is 8951121.

It is an interprime number because it is at equal distance from previous prime (1211597) and next prime (1211599).

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

It is a plaindrome in base 14 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211593) 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, 4236 + ... + 4512.

It is an arithmetic number, because the mean of its divisors is an integer number (85485).

2^1211598 is an apocalyptic number.

1211598 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 1211598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367760).

1211598 is an abundant number, since it is smaller than the sum of its proper divisors (1523922).

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

1211598 is an frugal number, since it uses more digits than its factorization.

1211598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 282 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1211598 is about 1100.7261239745. The cubic root of 1211598 is about 106.6071130238.

The spelling of 1211598 in words is "one million, two hundred eleven thousand, five hundred ninety-eight".