1243870 has 16 divisors (see below), whose sum is σ = 2255040. Its totient is φ = 493984.

The previous prime is 1243859. The next prime is 1243877. The reversal of 1243870 is 783421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243877) 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, 1371 + ... + 2089.

It is an arithmetic number, because the mean of its divisors is an integer number (140940).

2^1243870 is an apocalyptic number.

1243870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243870 is a deficient number, since it is larger than the sum of its proper divisors (1011170).

1243870 is a wasteful number, since it uses less digits than its factorization.

1243870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1243870 is about 1115.2892001629. The cubic root of 1243870 is about 107.5453567391.

The spelling of 1243870 in words is "one million, two hundred forty-three thousand, eight hundred seventy".