8400620 has 24 divisors (see below), whose sum is σ = 17766000. Its totient is φ = 3336512.

The previous prime is 8400619. The next prime is 8400629. The reversal of 8400620 is 260048.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 8400592 and 8400601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400629) 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, 1571 + ... + 4389.

It is an arithmetic number, because the mean of its divisors is an integer number (740250).

Almost surely, 2^8400620 is an apocalyptic number.

It is an amenable number.

8400620 is an abundant number, since it is smaller than the sum of its proper divisors (9365380).

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

8400620 is a wasteful number, since it uses less digits than its factorization.

8400620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 8400620 is about 2898.3823074260. The cubic root of 8400620 is about 203.2842725553.

Adding to 8400620 its reverse (260048), we get a palindrome (8660668).

The spelling of 8400620 in words is "eight million, four hundred thousand, six hundred twenty".