2758921 has 9 divisors (see below), whose sum is σ = 3052749. Its totient is φ = 2491500.

The previous prime is 2758901. The next prime is 2758937. The reversal of 2758921 is 1298572.

The square root of 2758921 is 1661.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2758921 - 2⁷ = 2758793 is a prime.

It is a super-2 number, since 2×2758921² = 15223290168482, which contains 22 as substring.

It is a Duffinian number.

2758921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2758901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18196 + ... + 18346.

2^2758921 is an apocalyptic number.

2758921 is the 1661-st square number.

2758921 is the 831-st centered octagonal number.

It is an amenable number.

2758921 is a deficient number, since it is larger than the sum of its proper divisors (293828).

2758921 is an equidigital number, since it uses as much as digits as its factorization.

2758921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 162 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The cubic root of 2758921 is about 140.2532999352.

The spelling of 2758921 in words is "two million, seven hundred fifty-eight thousand, nine hundred twenty-one".