1620242 has 16 divisors (see below), whose sum is σ = 2647512. Its totient is φ = 739200.

The previous prime is 1620239. The next prime is 1620247. The reversal of 1620242 is 2420261.

It can be written as a sum of positive squares in 4 ways, for example, as 1100401 + 519841 = 1049^2 + 721^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1620242.

It is not an unprimeable number, because it can be changed into a prime (1620247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2318 + ... + 2934.

2^1620242 is an apocalyptic number.

1620242 is a deficient number, since it is larger than the sum of its proper divisors (1027270).

1620242 is a wasteful number, since it uses less digits than its factorization.

1620242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1620242 is about 1272.8872691641. The cubic root of 1620242 is about 117.4518770795.

The spelling of 1620242 in words is "one million, six hundred twenty thousand, two hundred forty-two".