2139890 has 8 divisors (see below), whose sum is σ = 3851820. Its totient is φ = 855952.

The previous prime is 2139877. The next prime is 2139911. The reversal of 2139890 is 989312.

It can be written as a sum of positive squares in 2 ways, for example, as 2070721 + 69169 = 1439^2 + 263^2 .

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

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, 106985 + ... + 107004.

2^2139890 is an apocalyptic number.

2139890 is a deficient number, since it is larger than the sum of its proper divisors (1711930).

2139890 is a wasteful number, since it uses less digits than its factorization.

2139890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213996.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2139890 is about 1462.8362861236. The cubic root of 2139890 is about 128.8636662341.

The spelling of 2139890 in words is "two million, one hundred thirty-nine thousand, eight hundred ninety".