1620408 has 32 divisors (see below), whose sum is σ = 4095360. Its totient is φ = 534240.

The previous prime is 1620403. The next prime is 1620413. The reversal of 1620408 is 8040261.

It is an interprime number because it is at equal distance from previous prime (1620403) and next prime (1620413).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2253 + ... + 2883.

It is an arithmetic number, because the mean of its divisors is an integer number (127980).

2^1620408 is an apocalyptic number.

It is an amenable number.

1620408 is an abundant number, since it is smaller than the sum of its proper divisors (2474952).

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

1620408 is a wasteful number, since it uses less digits than its factorization.

1620408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1620408 is about 1272.9524735826. The cubic root of 1620408 is about 117.4558880741.

Adding to 1620408 its reverse (8040261), we get a palindrome (9660669).

The spelling of 1620408 in words is "one million, six hundred twenty thousand, four hundred eight".