1401820 has 96 divisors (see below), whose sum is σ = 3870720. Its totient is φ = 414720.

The previous prime is 1401817. The next prime is 1401821. The reversal of 1401820 is 281041.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1401794 and 1401803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45205 + ... + 45235.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2^1401820 is an apocalyptic number.

1401820 is a gapful number since it is divisible by the number (10) 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 1401820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935360).

1401820 is an abundant number, since it is smaller than the sum of its proper divisors (2468900).

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

1401820 is a wasteful number, since it uses less digits than its factorization.

1401820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1401820 is about 1183.9847971997. The cubic root of 1401820 is about 111.9173497376.

Adding to 1401820 its reverse (281041), we get a palindrome (1682861).

The spelling of 1401820 in words is "one million, four hundred one thousand, eight hundred twenty".