1287400730 has 64 divisors (see below), whose sum is σ = 2936597760. Its totient is φ = 394675200.

The previous prime is 1287400721. The next prime is 1287400747. The reversal of 1287400730 is 370047821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33266 + ... + 60674.

It is an arithmetic number, because the mean of its divisors is an integer number (45884340).

Almost surely, 2^1287400730 is an apocalyptic number.

1287400730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287400730 is an abundant number, since it is smaller than the sum of its proper divisors (1649197030).

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

1287400730 is a wasteful number, since it uses less digits than its factorization.

1287400730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27495.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 1287400730 is about 35880.3669156267. The cubic root of 1287400730 is about 1087.8555965763.

The spelling of 1287400730 in words is "one billion, two hundred eighty-seven million, four hundred thousand, seven hundred thirty".