1273440 has 96 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 290304.

The previous prime is 1273423. The next prime is 1273457. The reversal of 1273440 is 443721.

It is an interprime number because it is at equal distance from previous prime (1273423) and next prime (1273457).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 3171 + ... + 3549.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2^1273440 is an apocalyptic number.

1273440 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 1273440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298240).

1273440 is an abundant number, since it is smaller than the sum of its proper divisors (3323040).

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

1273440 is a wasteful number, since it uses less digits than its factorization.

1273440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1273440 is about 1128.4679880262. The cubic root of 1273440 is about 108.3909016841.

The spelling of 1273440 in words is "one million, two hundred seventy-three thousand, four hundred forty".