1243620 has 144 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 278208.

The previous prime is 1243609. The next prime is 1243631. The reversal of 1243620 is 263421.

It is a happy number.

1243620 is a `hidden beast` number, since 1 + 2 + 43 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (1243609) and next prime (1243631).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1243593 and 1243602.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26437 + ... + 26483.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2^1243620 is an apocalyptic number.

1243620 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 1243620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298240).

1243620 is an abundant number, since it is smaller than the sum of its proper divisors (3352860).

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

1243620 is a wasteful number, since it uses less digits than its factorization.

1243620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1243620 is about 1115.1771159775. The cubic root of 1243620 is about 107.5381512325.

The spelling of 1243620 in words is "one million, two hundred forty-three thousand, six hundred twenty".