2357921 has 2 divisors, whose sum is σ = 2357922. Its totient is φ = 2357920.

The previous prime is 2357909. The next prime is 2357923. The reversal of 2357921 is 1297532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 1123600 = 1111^2 + 1060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2357921 is a prime.

Together with 2357923, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2357923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178960 + 1178961.

It is an arithmetic number, because the mean of its divisors is an integer number (1178961).

2^2357921 is an apocalyptic number.

It is an amenable number.

2357921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2357921 is an equidigital number, since it uses as much as digits as its factorization.

2357921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 29.

The square root of 2357921 is about 1535.5523436210. The cubic root of 2357921 is about 133.0994977856.

The spelling of 2357921 in words is "two million, three hundred fifty-seven thousand, nine hundred twenty-one".