7021957 has 4 divisors (see below), whose sum is σ = 7077376. Its totient is φ = 6966540.

The previous prime is 7021951. The next prime is 7021979. The reversal of 7021957 is 7591207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7021957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7021951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27519 + ... + 27772.

It is an arithmetic number, because the mean of its divisors is an integer number (1769344).

Almost surely, 2^7021957 is an apocalyptic number.

It is an amenable number.

7021957 is a deficient number, since it is larger than the sum of its proper divisors (55419).

7021957 is a wasteful number, since it uses less digits than its factorization.

7021957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55418.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 7021957 is about 2649.8975451892. The cubic root of 7021957 is about 191.4929201345.

The spelling of 7021957 in words is "seven million, twenty-one thousand, nine hundred fifty-seven".