1399858 has 8 divisors (see below), whose sum is σ = 2156652. Its totient is φ = 680976.

The previous prime is 1399847. The next prime is 1399861. The reversal of 1399858 is 8589931.

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 205209 = 1093^2 + 453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9385 + ... + 9532.

2^1399858 is an apocalyptic number.

1399858 is a deficient number, since it is larger than the sum of its proper divisors (756794).

1399858 is a wasteful number, since it uses less digits than its factorization.

1399858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18956.

The product of its digits is 77760, while the sum is 43.

The square root of 1399858 is about 1183.1559491462. The cubic root of 1399858 is about 111.8651118462.

The spelling of 1399858 in words is "one million, three hundred ninety-nine thousand, eight hundred fifty-eight".