2191436 has 48 divisors (see below), whose sum is σ = 4558176. Its totient is φ = 912384.

The previous prime is 2191433. The next prime is 2191451. The reversal of 2191436 is 6341912.

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 2⁷ + 1 + 9⁶ + 1 + 4⁸ + 3¹³ + 6 .

It is not an unprimeable number, because it can be changed into a prime (2191433) 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, 32675 + ... + 32741.

It is an arithmetic number, because the mean of its divisors is an integer number (94962).

2^2191436 is an apocalyptic number.

2191436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2191436 is an abundant number, since it is smaller than the sum of its proper divisors (2366740).

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

2191436 is a wasteful number, since it uses less digits than its factorization.

2191436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 2191436 is about 1480.3499586246. The cubic root of 2191436 is about 129.8901636362.

The spelling of 2191436 in words is "two million, one hundred ninety-one thousand, four hundred thirty-six".