1620400 has 30 divisors (see below), whose sum is σ = 3893972. Its totient is φ = 648000.

The previous prime is 1620391. The next prime is 1620403. The reversal of 1620400 is 40261.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1626 + ... + 2425.

2^1620400 is an apocalyptic number.

1620400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620400 is an abundant number, since it is smaller than the sum of its proper divisors (2273572).

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

1620400 is a wasteful number, since it uses less digits than its factorization.

1620400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069 (or 4058 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1620400 is about 1272.9493312776. The cubic root of 1620400 is about 117.4556947794.

Adding to 1620400 its reverse (40261), we get a palindrome (1660661).

The spelling of 1620400 in words is "one million, six hundred twenty thousand, four hundred".