1640396 has 12 divisors (see below), whose sum is σ = 2963520. Its totient is φ = 793680.

The previous prime is 1640393. The next prime is 1640399. The reversal of 1640396 is 6930461.

It is an interprime number because it is at equal distance from previous prime (1640393) and next prime (1640399).

1640396 is a modest number, since divided by 396 gives 164 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1640393) 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, 6491 + ... + 6738.

It is an arithmetic number, because the mean of its divisors is an integer number (246960).

2^1640396 is an apocalyptic number.

It is an amenable number.

1640396 is a deficient number, since it is larger than the sum of its proper divisors (1323124).

1640396 is a wasteful number, since it uses less digits than its factorization.

1640396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13264 (or 13262 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1640396 is about 1280.7794501787. The cubic root of 1640396 is about 117.9368617508.

The spelling of 1640396 in words is "one million, six hundred forty thousand, three hundred ninety-six".