1397940 has 48 divisors (see below), whose sum is σ = 4088448. Its totient is φ = 356224.

The previous prime is 1397939. The next prime is 1397951. The reversal of 1397940 is 497931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 874 + ... + 1886.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2^1397940 is an apocalyptic number.

1397940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2044224).

1397940 is an abundant number, since it is smaller than the sum of its proper divisors (2690508).

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

1397940 is a wasteful number, since it uses less digits than its factorization.

1397940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1397940 is about 1182.3451272788. The cubic root of 1397940 is about 111.8139982451.

Subtracting from 1397940 its reverse (497931), we obtain a palindrome (900009).

The spelling of 1397940 in words is "one million, three hundred ninety-seven thousand, nine hundred forty".