2139406 has 8 divisors (see below), whose sum is σ = 3223584. Its totient is φ = 1064880.

The previous prime is 2139383. The next prime is 2139407. The reversal of 2139406 is 6049312.

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 (2139407) 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, 1830 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (402948).

2^2139406 is an apocalyptic number.

2139406 is a deficient number, since it is larger than the sum of its proper divisors (1084178).

2139406 is a wasteful number, since it uses less digits than its factorization.

2139406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2139406 is about 1462.6708447221. The cubic root of 2139406 is about 128.8539500466.

The spelling of 2139406 in words is "two million, one hundred thirty-nine thousand, four hundred six".