1251878 has 4 divisors (see below), whose sum is σ = 1877820. Its totient is φ = 625938.

The previous prime is 1251871. The next prime is 1251881. The reversal of 1251878 is 8781521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8781521 = 7 ⋅1254503.

It is a super-4 number, since 4×1251878⁴ (a number of 25 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312968 + ... + 312971.

It is an arithmetic number, because the mean of its divisors is an integer number (469455).

2^1251878 is an apocalyptic number.

1251878 is a deficient number, since it is larger than the sum of its proper divisors (625942).

1251878 is an equidigital number, since it uses as much as digits as its factorization.

1251878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625941.

The product of its digits is 4480, while the sum is 32.

The square root of 1251878 is about 1118.8735406649. The cubic root of 1251878 is about 107.7756545521.

The spelling of 1251878 in words is "one million, two hundred fifty-one thousand, eight hundred seventy-eight".