1620424 has 16 divisors (see below), whose sum is σ = 3272220. Its totient is φ = 747840.

The previous prime is 1620413. The next prime is 1620431. The reversal of 1620424 is 4240261.

It can be written as a sum of positive squares in 2 ways, for example, as 1483524 + 136900 = 1218^2 + 370^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7687 + ... + 7894.

2^1620424 is an apocalyptic number.

It is an amenable number.

1620424 is an abundant number, since it is smaller than the sum of its proper divisors (1651796).

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

1620424 is a wasteful number, since it uses less digits than its factorization.

1620424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600 (or 15596 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1620424 is about 1272.9587581693. The cubic root of 1620424 is about 117.4562746615.

Adding to 1620424 its reverse (4240261), we get a palindrome (5860685).

The spelling of 1620424 in words is "one million, six hundred twenty thousand, four hundred twenty-four".