1399428 has 18 divisors (see below), whose sum is σ = 3537534. Its totient is φ = 466464.

The previous prime is 1399427. The next prime is 1399439. The reversal of 1399428 is 8249931.

It can be written as a sum of positive squares in only one way, i.e., 1397124 + 2304 = 1182^2 + 48^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38873 = 1399428 / (1 + 3 + 9 + 9 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1399392 and 1399401.

It is not an unprimeable number, because it can be changed into a prime (1399427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19401 + ... + 19472.

2^1399428 is an apocalyptic number.

1399428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1399428 is an abundant number, since it is smaller than the sum of its proper divisors (2138106).

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

1399428 is a wasteful number, since it uses less digits than its factorization.

1399428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38883 (or 38878 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1399428 is about 1182.9742178087. The cubic root of 1399428 is about 111.8536566548.

The spelling of 1399428 in words is "one million, three hundred ninety-nine thousand, four hundred twenty-eight".