1275431340 has 24 divisors (see below), whose sum is σ = 3571207920. Its totient is φ = 340115008.

The previous prime is 1275431317. The next prime is 1275431359. The reversal of 1275431340 is 431345721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1275431298 and 1275431307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10628535 + ... + 10628654.

It is an arithmetic number, because the mean of its divisors is an integer number (148800330).

Almost surely, 2^1275431340 is an apocalyptic number.

1275431340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275431340 is an abundant number, since it is smaller than the sum of its proper divisors (2295776580).

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

1275431340 is a wasteful number, since it uses less digits than its factorization.

1275431340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21257201 (or 21257199 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 1275431340 is about 35713.1816000759. The cubic root of 1275431340 is about 1084.4737096621.

The spelling of 1275431340 in words is "one billion, two hundred seventy-five million, four hundred thirty-one thousand, three hundred forty".