2155406 has 8 divisors (see below), whose sum is σ = 3527064. Its totient is φ = 979720.

The previous prime is 2155397. The next prime is 2155409. The reversal of 2155406 is 6045512.

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 (2155409) 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, 48965 + ... + 49008.

It is an arithmetic number, because the mean of its divisors is an integer number (440883).

2^2155406 is an apocalyptic number.

2155406 is a deficient number, since it is larger than the sum of its proper divisors (1371658).

2155406 is a wasteful number, since it uses less digits than its factorization.

2155406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97986.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2155406 is about 1468.1301032265. The cubic root of 2155406 is about 129.1743730863.

The spelling of 2155406 in words is "two million, one hundred fifty-five thousand, four hundred six".