1266820 has 24 divisors (see below), whose sum is σ = 2691864. Its totient is φ = 500736.

The previous prime is 1266799. The next prime is 1266841. The reversal of 1266820 is 286621.

It is an interprime number because it is at equal distance from previous prime (1266799) and next prime (1266841).

It can be written as a sum of positive squares in 4 ways, for example, as 30276 + 1236544 = 174^2 + 1112^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1614 + ... + 2266.

It is an arithmetic number, because the mean of its divisors is an integer number (112161).

2^1266820 is an apocalyptic number.

1266820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266820 is an abundant number, since it is smaller than the sum of its proper divisors (1425044).

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

1266820 is a wasteful number, since it uses less digits than its factorization.

1266820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1266820 is about 1125.5309858018. The cubic root of 1266820 is about 108.2027512759.

The spelling of 1266820 in words is "one million, two hundred sixty-six thousand, eight hundred twenty".