1663957 has 4 divisors (see below), whose sum is σ = 1679616. Its totient is φ = 1648300.

The previous prime is 1663951. The next prime is 1663967. The reversal of 1663957 is 7593661.

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 not a de Polignac number, because 1663957 - 2¹⁹ = 1139669 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 (1663951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7669 + ... + 7882.

It is an arithmetic number, because the mean of its divisors is an integer number (419904).

2^1663957 is an apocalyptic number.

It is an amenable number.

1663957 is a deficient number, since it is larger than the sum of its proper divisors (15659).

1663957 is a wasteful number, since it uses less digits than its factorization.

1663957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15658.

The product of its digits is 34020, while the sum is 37.

The square root of 1663957 is about 1289.9445724526. The cubic root of 1663957 is about 118.4988219957.

The spelling of 1663957 in words is "one million, six hundred sixty-three thousand, nine hundred fifty-seven".