2139730 has 8 divisors (see below), whose sum is σ = 3851532. Its totient is φ = 855888.

The previous prime is 2139691. The next prime is 2139733. The reversal of 2139730 is 379312.

It can be written as a sum of positive squares in 2 ways, for example, as 1985281 + 154449 = 1409^2 + 393^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2139695 and 2139704.

It is not an unprimeable number, because it can be changed into a prime (2139733) 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, 106977 + ... + 106996.

2^2139730 is an apocalyptic number.

2139730 is a deficient number, since it is larger than the sum of its proper divisors (1711802).

2139730 is a wasteful number, since it uses less digits than its factorization.

2139730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213980.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 2139730 is about 1462.7815968216. The cubic root of 2139730 is about 128.8604544334.

The spelling of 2139730 in words is "two million, one hundred thirty-nine thousand, seven hundred thirty".