1297940 has 48 divisors (see below), whose sum is σ = 3182592. Its totient is φ = 435456.

The previous prime is 1297927. The next prime is 1297963. The reversal of 1297940 is 497921.

It is a junction number, because it is equal to n+sod(n) for n = 1297897 and 1297906.

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, 10157 + ... + 10283.

It is an arithmetic number, because the mean of its divisors is an integer number (66304).

2^1297940 is an apocalyptic number.

1297940 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 1297940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591296).

1297940 is an abundant number, since it is smaller than the sum of its proper divisors (1884652).

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

1297940 is a wasteful number, since it uses less digits than its factorization.

1297940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1297940 is about 1139.2716971820. The cubic root of 1297940 is about 109.0816098976.

The spelling of 1297940 in words is "one million, two hundred ninety-seven thousand, nine hundred forty".