1259897440 has 24 divisors (see below), whose sum is σ = 2976508080. Its totient is φ = 503958912.

The previous prime is 1259897411. The next prime is 1259897497. The reversal of 1259897440 is 447989521.

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, 3937020 + ... + 3937339.

It is an arithmetic number, because the mean of its divisors is an integer number (124021170).

Almost surely, 2^1259897440 is an apocalyptic number.

1259897440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1259897440 is an abundant number, since it is smaller than the sum of its proper divisors (1716610640).

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

1259897440 is an equidigital number, since it uses as much as digits as its factorization.

1259897440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7874374 (or 7874366 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1259897440 is about 35495.0340188596. The cubic root of 1259897440 is about 1080.0529923701.

The spelling of 1259897440 in words is "one billion, two hundred fifty-nine million, eight hundred ninety-seven thousand, four hundred forty".