1640453 has 4 divisors (see below), whose sum is σ = 1644000. Its totient is φ = 1636908.

The previous prime is 1640447. The next prime is 1640461. The reversal of 1640453 is 3540461.

It is a happy number.

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 1640453 - 2¹⁴ = 1624069 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 (1640423) 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, 953 + ... + 2046.

It is an arithmetic number, because the mean of its divisors is an integer number (411000).

2^1640453 is an apocalyptic number.

It is an amenable number.

1640453 is a deficient number, since it is larger than the sum of its proper divisors (3547).

1640453 is an equidigital number, since it uses as much as digits as its factorization.

1640453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1640453 is about 1280.8017020601. The cubic root of 1640453 is about 117.9382277468.

The spelling of 1640453 in words is "one million, six hundred forty thousand, four hundred fifty-three".