1399720 has 32 divisors (see below), whose sum is σ = 3600000. Its totient is φ = 479808.

The previous prime is 1399709. The next prime is 1399721. The reversal of 1399720 is 279931.

1399720 = T₁₉₅ + T₁₉₆ + ... + T₂₅₀.

It is not an unprimeable number, because it can be changed into a prime (1399721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220 + ... + 2779.

It is an arithmetic number, because the mean of its divisors is an integer number (112500).

2^1399720 is an apocalyptic number.

1399720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399720 is an abundant number, since it is smaller than the sum of its proper divisors (2200280).

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

1399720 is a wasteful number, since it uses less digits than its factorization.

1399720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017 (or 5013 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1399720 is about 1183.0976291076. The cubic root of 1399720 is about 111.8614357846.

The spelling of 1399720 in words is "one million, three hundred ninety-nine thousand, seven hundred twenty".