1273534740 has 72 divisors (see below), whose sum is σ = 3868949448. Its totient is φ = 339091200.

The previous prime is 1273534729. The next prime is 1273534789. The reversal of 1273534740 is 474353721.

1273534740 is a `hidden beast` number, since 1 + 273 + 5 + 347 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 324648324 + 948886416 = 18018^2 + 30804^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1273534695 and 1273534704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121134 + ... + 131226.

It is an arithmetic number, because the mean of its divisors is an integer number (53735409).

Almost surely, 2^1273534740 is an apocalyptic number.

1273534740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273534740 is an abundant number, since it is smaller than the sum of its proper divisors (2595414708).

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

1273534740 is a wasteful number, since it uses less digits than its factorization.

1273534740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10809 (or 10804 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 1273534740 is about 35686.6185004968. The cubic root of 1273534740 is about 1083.9358960018.

The spelling of 1273534740 in words is "one billion, two hundred seventy-three million, five hundred thirty-four thousand, seven hundred forty".