2143690 has 12 divisors (see below), whose sum is σ = 3866994. Its totient is φ = 855624.

The previous prime is 2143667. The next prime is 2143711. The reversal of 2143690 is 963412.

It can be written as a sum of positive squares in only one way, i.e., 1929321 + 214369 = 1389^2 + 463^2 .

It is a super-2 number, since 2×2143690² = 9190813632200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4399 + ... + 4861.

2^2143690 is an apocalyptic number.

2143690 is a deficient number, since it is larger than the sum of its proper divisors (1723304).

2143690 is an frugal number, since it uses more digits than its factorization.

2143690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 470 counting only the distinct ones).

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

The square root of 2143690 is about 1464.1345566580. The cubic root of 2143690 is about 128.9398994921.

The spelling of 2143690 in words is "two million, one hundred forty-three thousand, six hundred ninety".