1213542 has 48 divisors (see below), whose sum is σ = 2987712. Its totient is φ = 366120.

The previous prime is 1213529. The next prime is 1213547. The reversal of 1213542 is 2453121.

1213542 is a `hidden beast` number, since 121 + 3 + 542 = 666.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5233 + ... + 5459.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2^1213542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493856).

1213542 is an abundant number, since it is smaller than the sum of its proper divisors (1774170).

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

1213542 is a wasteful number, since it uses less digits than its factorization.

1213542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 243 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 1213542 is about 1101.6088234941. The cubic root of 1213542 is about 106.6640993306.

Adding to 1213542 its reverse (2453121), we get a palindrome (3666663).

It can be divided in two parts, 121 and 3542, that added together give a palindrome (3663).

The spelling of 1213542 in words is "one million, two hundred thirteen thousand, five hundred forty-two".