1390436 has 6 divisors (see below), whose sum is σ = 2433270. Its totient is φ = 695216.

The previous prime is 1390421. The next prime is 1390457. The reversal of 1390436 is 6340931.

It can be written as a sum of positive squares in only one way, i.e., 1196836 + 193600 = 1094^2 + 440^2 .

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 as a sum of consecutive naturals, namely, 173801 + ... + 173808.

It is an arithmetic number, because the mean of its divisors is an integer number (405545).

2^1390436 is an apocalyptic number.

It is an amenable number.

1390436 is a deficient number, since it is larger than the sum of its proper divisors (1042834).

1390436 is a wasteful number, since it uses less digits than its factorization.

1390436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347613 (or 347611 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1390436 is about 1179.1675029443. The cubic root of 1390436 is about 111.6135704604.

The spelling of 1390436 in words is "one million, three hundred ninety thousand, four hundred thirty-six".