1273432440 has 256 divisors, whose sum is σ = 4663065600. Its totient is φ = 271724544.

The previous prime is 1273432439. The next prime is 1273432463. The reversal of 1273432440 is 442343721.

1273432440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 = 1273432398 and 1273432407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1164534 + ... + 1165626.

It is an arithmetic number, because the mean of its divisors is an integer number (18215100).

Almost surely, 2^1273432440 is an apocalyptic number.

1273432440 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 1273432440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331532800).

1273432440 is an abundant number, since it is smaller than the sum of its proper divisors (3389633160).

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

1273432440 is a wasteful number, since it uses less digits than its factorization.

1273432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 1273432440 is about 35685.1851613523. The cubic root of 1273432440 is about 1083.9068718985.

The spelling of 1273432440 in words is "one billion, two hundred seventy-three million, four hundred thirty-two thousand, four hundred forty".