2921247 has 24 divisors (see below), whose sum is σ = 4885920. Its totient is φ = 1647360.

The previous prime is 2921239. The next prime is 2921249. The reversal of 2921247 is 7421292.

It is not a de Polignac number, because 2921247 - 2³ = 2921239 is a prime.

It is an Ulam number.

2921247 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2921247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5347 + ... + 5867.

It is an arithmetic number, because the mean of its divisors is an integer number (203580).

2^2921247 is an apocalyptic number.

2921247 is a deficient number, since it is larger than the sum of its proper divisors (1964673).

2921247 is a wasteful number, since it uses less digits than its factorization.

2921247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 620 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2921247 is about 1709.1655858927. The cubic root of 2921247 is about 142.9517335924.

The spelling of 2921247 in words is "two million, nine hundred twenty-one thousand, two hundred forty-seven".