2158442 has 16 divisors (see below), whose sum is σ = 3804192. Its totient is φ = 905520.

The previous prime is 2158433. The next prime is 2158447. The reversal of 2158442 is 2448512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a d-powerful number, because it can be written as 2¹³ + 1 + 5⁹ + 8³ + 4 + 4⁸ + 2¹⁷ .

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2158447) 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, 3488 + ... + 4059.

It is an arithmetic number, because the mean of its divisors is an integer number (237762).

2^2158442 is an apocalyptic number.

2158442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2158442 is a deficient number, since it is larger than the sum of its proper divisors (1645750).

2158442 is a wasteful number, since it uses less digits than its factorization.

2158442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573.

The product of its digits is 2560, while the sum is 26.

The square root of 2158442 is about 1469.1637076922. The cubic root of 2158442 is about 129.2349942111.

The spelling of 2158442 in words is "two million, one hundred fifty-eight thousand, four hundred forty-two".