2921290 has 16 divisors (see below), whose sum is σ = 5345640. Its totient is φ = 1149120.

The previous prime is 2921273. The next prime is 2921293. The reversal of 2921290 is 921292.

It can be written as a sum of positive squares in 4 ways, for example, as 786769 + 2134521 = 887^2 + 1461^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2921293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785 + ... + 3004.

2^2921290 is an apocalyptic number.

2921290 is a deficient number, since it is larger than the sum of its proper divisors (2424350).

2921290 is a wasteful number, since it uses less digits than its factorization.

2921290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2921290 is about 1709.1781650840. The cubic root of 2921290 is about 142.9524349932.

The spelling of 2921290 in words is "two million, nine hundred twenty-one thousand, two hundred ninety".