1640057 has 2 divisors, whose sum is σ = 1640058. Its totient is φ = 1640056.

The previous prime is 1640053. The next prime is 1640059. The reversal of 1640057 is 7500461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1628176 + 11881 = 1276^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640057 - 2² = 1640053 is a prime.

Together with 1640059, 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 (1640053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820028 + 820029.

It is an arithmetic number, because the mean of its divisors is an integer number (820029).

2^1640057 is an apocalyptic number.

It is an amenable number.

1640057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640057 is an equidigital number, since it uses as much as digits as its factorization.

1640057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1640057 is about 1280.6471020543. The cubic root of 1640057 is about 117.9287370153.

The spelling of 1640057 in words is "one million, six hundred forty thousand, fifty-seven".