1640907 has 12 divisors (see below), whose sum is σ = 2452320. Its totient is φ = 1056048.

The previous prime is 1640887. The next prime is 1640927. The reversal of 1640907 is 7090461.

It is an interprime number because it is at equal distance from previous prime (1640887) and next prime (1640927).

It is not a de Polignac number, because 1640907 - 2¹⁴ = 1624523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2883 + ... + 3404.

It is an arithmetic number, because the mean of its divisors is an integer number (204360).

2^1640907 is an apocalyptic number.

1640907 is a deficient number, since it is larger than the sum of its proper divisors (811413).

1640907 is a wasteful number, since it uses less digits than its factorization.

1640907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322 (or 6319 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1640907 is about 1280.9789225432. The cubic root of 1640907 is about 117.9491066558.

The spelling of 1640907 in words is "one million, six hundred forty thousand, nine hundred seven".