1253840 has 40 divisors (see below), whose sum is σ = 3333120. Its totient is φ = 429696.

The previous prime is 1253839. The next prime is 1253849. The reversal of 1253840 is 483521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1253840² = 3144229491200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560 + ... + 1679.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2^1253840 is an apocalyptic number.

1253840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253840 is an abundant number, since it is smaller than the sum of its proper divisors (2079280).

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

1253840 is a wasteful number, since it uses less digits than its factorization.

1253840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2253 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1253840 is about 1119.7499720920. The cubic root of 1253840 is about 107.8319287957.

The spelling of 1253840 in words is "one million, two hundred fifty-three thousand, eight hundred forty".