1392040 has 32 divisors (see below), whose sum is σ = 3374280. Its totient is φ = 513792.

The previous prime is 1392007. The next prime is 1392089. The reversal of 1392040 is 402931.

It can be written as a sum of positive squares in 4 ways, for example, as 427716 + 964324 = 654^2 + 982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1391999 and 1392017.

It is a congruent number.

It is an unprimeable number.

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, 819 + ... + 1858.

2^1392040 is an apocalyptic number.

1392040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1392040 is an abundant number, since it is smaller than the sum of its proper divisors (1982240).

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

1392040 is a wasteful number, since it uses less digits than its factorization.

1392040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701 (or 2697 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1392040 is about 1179.8474477660. The cubic root of 1392040 is about 111.6564729191.

Adding to 1392040 its reverse (402931), we get a palindrome (1794971).

The spelling of 1392040 in words is "one million, three hundred ninety-two thousand, forty".