2145730 has 16 divisors (see below), whose sum is σ = 3883320. Its totient is φ = 853632.

The previous prime is 2145721. The next prime is 2145763. The reversal of 2145730 is 375412.

It can be written as a sum of positive squares in 4 ways, for example, as 1687401 + 458329 = 1299^2 + 677^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822 + ... + 2758.

2^2145730 is an apocalyptic number.

2145730 is a deficient number, since it is larger than the sum of its proper divisors (1737590).

2145730 is a wasteful number, since it uses less digits than its factorization.

2145730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 2145730 is about 1464.8310482783. The cubic root of 2145730 is about 128.9807875560.

The spelling of 2145730 in words is "two million, one hundred forty-five thousand, seven hundred thirty".