1640272 has 20 divisors (see below), whose sum is σ = 3281536. Its totient is φ = 793440.

The previous prime is 1640267. The next prime is 1640273. The reversal of 1640272 is 2720461.

1640272 is an admirable number.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640273) 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, 1158 + ... + 2149.

2^1640272 is an apocalyptic number.

It is an amenable number.

1640272 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640272 is a wasteful number, since it uses less digits than its factorization.

1640272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1640272 is about 1280.7310412417. The cubic root of 1640272 is about 117.9338900010.

The spelling of 1640272 in words is "one million, six hundred forty thousand, two hundred seventy-two".