2153906 has 4 divisors (see below), whose sum is σ = 3230862. Its totient is φ = 1076952.

The previous prime is 2153903. The next prime is 2153909. The reversal of 2153906 is 6093512.

2153906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2153903) and next prime (2153909).

It can be written as a sum of positive squares in only one way, i.e., 1651225 + 502681 = 1285^2 + 709^2 .

It is a super-2 number, since 2×2153906² = 9278622113672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2153903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538475 + ... + 538478.

2^2153906 is an apocalyptic number.

2153906 is a deficient number, since it is larger than the sum of its proper divisors (1076956).

2153906 is a wasteful number, since it uses less digits than its factorization.

2153906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076955.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2153906 is about 1467.6191604091. The cubic root of 2153906 is about 129.1444009256.

The spelling of 2153906 in words is "two million, one hundred fifty-three thousand, nine hundred six".