3620400 has 120 divisors (see below), whose sum is σ = 13284864. Its totient is φ = 825600.

The previous prime is 3620387. The next prime is 3620401. The reversal of 3620400 is 40263.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 3620400.

It is not an unprimeable number, because it can be changed into a prime (3620401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8185 + ... + 8615.

Almost surely, 2^3620400 is an apocalyptic number.

3620400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3620400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6642432).

3620400 is an abundant number, since it is smaller than the sum of its proper divisors (9664464).

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

3620400 is a wasteful number, since it uses less digits than its factorization.

3620400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 3620400 is about 1902.7348738066. The cubic root of 3620400 is about 153.5508360449.

Adding to 3620400 its reverse (40263), we get a palindrome (3660663).

The spelling of 3620400 in words is "three million, six hundred twenty thousand, four hundred".