1251398 has 4 divisors (see below), whose sum is σ = 1877100. Its totient is φ = 625698.

The previous prime is 1251329. The next prime is 1251409. The reversal of 1251398 is 8931521.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1251398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312848 + ... + 312851.

It is an arithmetic number, because the mean of its divisors is an integer number (469275).

2^1251398 is an apocalyptic number.

1251398 is a deficient number, since it is larger than the sum of its proper divisors (625702).

1251398 is an equidigital number, since it uses as much as digits as its factorization.

1251398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625701.

The product of its digits is 2160, while the sum is 29.

The square root of 1251398 is about 1118.6590186469. The cubic root of 1251398 is about 107.7618782024.

The spelling of 1251398 in words is "one million, two hundred fifty-one thousand, three hundred ninety-eight".