1428737509 has 8 divisors (see below), whose sum is σ = 1517991840. Its totient is φ = 1340888976.

The previous prime is 1428737503. The next prime is 1428737533. The reversal of 1428737509 is 9057378241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1428737509 - 2¹⁵ = 1428704741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428737503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349354 + ... + 353419.

It is an arithmetic number, because the mean of its divisors is an integer number (189748980).

Almost surely, 2^1428737509 is an apocalyptic number.

1428737509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1428737509 is a deficient number, since it is larger than the sum of its proper divisors (89254331).

1428737509 is a wasteful number, since it uses less digits than its factorization.

1428737509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702899.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 1428737509 is about 37798.6442746297. The cubic root of 1428737509 is about 1126.2915232229.

The spelling of 1428737509 in words is "one billion, four hundred twenty-eight million, seven hundred thirty-seven thousand, five hundred nine".