1399520 has 24 divisors (see below), whose sum is σ = 3306744. Its totient is φ = 559744.

The previous prime is 1399513. The next prime is 1399529. The reversal of 1399520 is 259931.

It is an Ulam number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399529) 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, 4214 + ... + 4533.

It is an arithmetic number, because the mean of its divisors is an integer number (137781).

2^1399520 is an apocalyptic number.

1399520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399520 is an abundant number, since it is smaller than the sum of its proper divisors (1907224).

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

1399520 is an equidigital number, since it uses as much as digits as its factorization.

1399520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8762 (or 8754 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 1399520 is about 1183.0131022098. The cubic root of 1399520 is about 111.8561077302.

The spelling of 1399520 in words is "one million, three hundred ninety-nine thousand, five hundred twenty".