1390940 has 24 divisors (see below), whose sum is σ = 3093552. Its totient is φ = 523520.

The previous prime is 1390937. The next prime is 1390967. The reversal of 1390940 is 490931.

1390940 = 278² + 279² + ... + 294².

It is a happy number.

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, 1706 + ... + 2385.

It is an arithmetic number, because the mean of its divisors is an integer number (128898).

2^1390940 is an apocalyptic number.

1390940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390940 is an abundant number, since it is smaller than the sum of its proper divisors (1702612).

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

1390940 is a wasteful number, since it uses less digits than its factorization.

1390940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1390940 is about 1179.3811936774. The cubic root of 1390940 is about 111.6270545868.

Subtracting from 1390940 its reverse (490931), we obtain a palindrome (900009).

The spelling of 1390940 in words is "one million, three hundred ninety thousand, nine hundred forty".