2191402 has 8 divisors (see below), whose sum is σ = 3480516. Its totient is φ = 1031232.

The previous prime is 2191393. The next prime is 2191429. The reversal of 2191402 is 2041912.

It can be written as a sum of positive squares in 2 ways, for example, as 2076481 + 114921 = 1441^2 + 339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2191402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32193 + ... + 32260.

2^2191402 is an apocalyptic number.

2191402 is a deficient number, since it is larger than the sum of its proper divisors (1289114).

2191402 is a wasteful number, since it uses less digits than its factorization.

2191402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64472.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2191402 is about 1480.3384748091. The cubic root of 2191402 is about 129.8894918866.

The spelling of 2191402 in words is "two million, one hundred ninety-one thousand, four hundred two".