2921890 has 32 divisors (see below), whose sum is σ = 5540400. Its totient is φ = 1108224.

The previous prime is 2921881. The next prime is 2921899. The reversal of 2921890 is 981292.

It is an interprime number because it is at equal distance from previous prime (2921881) and next prime (2921899).

It can be written as a sum of positive squares in 8 ways, for example, as 1615441 + 1306449 = 1271^2 + 1143^2 .

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 (2921899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19536 + ... + 19684.

2^2921890 is an apocalyptic number.

2921890 is a deficient number, since it is larger than the sum of its proper divisors (2618510).

2921890 is a wasteful number, since it uses less digits than its factorization.

2921890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2921890 is about 1709.3536790261. The cubic root of 2921890 is about 142.9622212622.

The spelling of 2921890 in words is "two million, nine hundred twenty-one thousand, eight hundred ninety".