1238780 has 24 divisors (see below), whose sum is σ = 2715552. Its totient is φ = 473792.

The previous prime is 1238771. The next prime is 1238789. The reversal of 1238780 is 878321.

1238780 = 390² + 391² + ... + 397².

It is an interprime number because it is at equal distance from previous prime (1238771) and next prime (1238789).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 1806.

It is an arithmetic number, because the mean of its divisors is an integer number (113148).

2^1238780 is an apocalyptic number.

1238780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238780 is an abundant number, since it is smaller than the sum of its proper divisors (1476772).

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

1238780 is a wasteful number, since it uses less digits than its factorization.

1238780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1238780 is about 1113.0049415883. The cubic root of 1238780 is about 107.3984619023.

The spelling of 1238780 in words is "one million, two hundred thirty-eight thousand, seven hundred eighty".