1292728 has 8 divisors (see below), whose sum is σ = 2423880. Its totient is φ = 646360.

The previous prime is 1292717. The next prime is 1292729. The reversal of 1292728 is 8272921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1292728² = 3342291363968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1292728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1292729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80788 + ... + 80803.

It is an arithmetic number, because the mean of its divisors is an integer number (302985).

2^1292728 is an apocalyptic number.

It is an amenable number.

1292728 is a deficient number, since it is larger than the sum of its proper divisors (1131152).

1292728 is a wasteful number, since it uses less digits than its factorization.

1292728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161597 (or 161593 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 1292728 is about 1136.9819699538. The cubic root of 1292728 is about 108.9354048720.

The spelling of 1292728 in words is "one million, two hundred ninety-two thousand, seven hundred twenty-eight".