1957667 has 2 divisors, whose sum is σ = 1957668. Its totient is φ = 1957666.

The previous prime is 1957663. The next prime is 1957693. The reversal of 1957667 is 7667591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1957667 - 2² = 1957663 is a prime.

It is not a weakly prime, because it can be changed into another prime (1957663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978833 + 978834.

It is an arithmetic number, because the mean of its divisors is an integer number (978834).

2^1957667 is an apocalyptic number.

1957667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957667 is an equidigital number, since it uses as much as digits as its factorization.

1957667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 1957667 is about 1399.1665376216. The cubic root of 1957667 is about 125.0968209862.

The spelling of 1957667 in words is "one million, nine hundred fifty-seven thousand, six hundred sixty-seven".