1399240 has 16 divisors (see below), whose sum is σ = 3148380. Its totient is φ = 559680.

The previous prime is 1399231. The next prime is 1399261. The reversal of 1399240 is 429931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1397124 + 2116 = 1182^2 + 46^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1399199 and 1399208.

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, 17451 + ... + 17530.

2^1399240 is an apocalyptic number.

1399240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399240 is an abundant number, since it is smaller than the sum of its proper divisors (1749140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399240 is a wasteful number, since it uses less digits than its factorization.

1399240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34992 (or 34988 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1399240 is about 1182.8947544055. The cubic root of 1399240 is about 111.8486476013.

The spelling of 1399240 in words is "one million, three hundred ninety-nine thousand, two hundred forty".