1640624 has 10 divisors (see below), whose sum is σ = 3178740. Its totient is φ = 820304.

The previous prime is 1640623. The next prime is 1640633. The reversal of 1640624 is 4260461.

It is a happy number.

It is an Ulam number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1640624.

It is not an unprimeable number, because it can be changed into a prime (1640621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51254 + ... + 51285.

It is an arithmetic number, because the mean of its divisors is an integer number (317874).

2^1640624 is an apocalyptic number.

It is an amenable number.

1640624 is a deficient number, since it is larger than the sum of its proper divisors (1538116).

1640624 is a wasteful number, since it uses less digits than its factorization.

1640624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102547 (or 102541 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1640624 is about 1280.8684553849. The cubic root of 1640624 is about 117.9423255450.

The spelling of 1640624 in words is "one million, six hundred forty thousand, six hundred twenty-four".