1257940 has 12 divisors (see below), whose sum is σ = 2641716. Its totient is φ = 503168.

The previous prime is 1257931. The next prime is 1257953. The reversal of 1257940 is 497521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 611524 = 804^2 + 782^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1257899 and 1257908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31429 + ... + 31468.

It is an arithmetic number, because the mean of its divisors is an integer number (220143).

2^1257940 is an apocalyptic number.

1257940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257940 is an abundant number, since it is smaller than the sum of its proper divisors (1383776).

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

1257940 is a wasteful number, since it uses less digits than its factorization.

1257940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62906 (or 62904 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1257940 is about 1121.5792437452. The cubic root of 1257940 is about 107.9493360904.

It can be divided in two parts, 1257 and 940, that added together give a cube (2197 = 13³).

The spelling of 1257940 in words is "one million, two hundred fifty-seven thousand, nine hundred forty".