1398787 has 4 divisors (see below), whose sum is σ = 1506400. Its totient is φ = 1291176.

The previous prime is 1398781. The next prime is 1398841. The reversal of 1398787 is 7878931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7878931 = 163 ⋅48337.

It is a cyclic number.

It is not a de Polignac number, because 1398787 - 2³ = 1398779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53787 + ... + 53812.

It is an arithmetic number, because the mean of its divisors is an integer number (376600).

2^1398787 is an apocalyptic number.

1398787 is a deficient number, since it is larger than the sum of its proper divisors (107613).

1398787 is a wasteful number, since it uses less digits than its factorization.

1398787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107612.

The product of its digits is 84672, while the sum is 43.

The square root of 1398787 is about 1182.7032594865. The cubic root of 1398787 is about 111.8365760705.

The spelling of 1398787 in words is "one million, three hundred ninety-eight thousand, seven hundred eighty-seven".