1395999 has 24 divisors (see below), whose sum is σ = 2246400. Its totient is φ = 828240.

The previous prime is 1395997. The next prime is 1396001. The reversal of 1395999 is 9995931.

It is an interprime number because it is at equal distance from previous prime (1395997) and next prime (1396001).

It is not a de Polignac number, because 1395999 - 2¹ = 1395997 is a prime.

It is an Ulam number.

1395999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5722 + ... + 5960.

It is an arithmetic number, because the mean of its divisors is an integer number (93600).

2^1395999 is an apocalyptic number.

1395999 is a deficient number, since it is larger than the sum of its proper divisors (850401).

1395999 is a wasteful number, since it uses less digits than its factorization.

1395999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 312 counting only the distinct ones).

The product of its digits is 98415, while the sum is 45.

The square root of 1395999 is about 1181.5240158372. The cubic root of 1395999 is about 111.7622240881.

The spelling of 1395999 in words is "one million, three hundred ninety-five thousand, nine hundred ninety-nine".