2151638 has 8 divisors (see below), whose sum is σ = 3275832. Its totient is φ = 1059696.

The previous prime is 2151637. The next prime is 2151647. The reversal of 2151638 is 8361512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7895 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (409479).

2^2151638 is an apocalyptic number.

2151638 is a deficient number, since it is larger than the sum of its proper divisors (1124194).

2151638 is a wasteful number, since it uses less digits than its factorization.

2151638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16126.

The product of its digits is 1440, while the sum is 26.

The square root of 2151638 is about 1466.8462768811. The cubic root of 2151638 is about 129.0990565812.

The spelling of 2151638 in words is "two million, one hundred fifty-one thousand, six hundred thirty-eight".