1931428 has 12 divisors (see below), whose sum is σ = 3462732. Its totient is φ = 942080.

The previous prime is 1931411. The next prime is 1931453. The reversal of 1931428 is 8241391.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 1304164 = 792^2 + 1142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1931396 and 1931405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5725 + ... + 6052.

It is an arithmetic number, because the mean of its divisors is an integer number (288561).

2^1931428 is an apocalyptic number.

It is an amenable number.

1931428 is a deficient number, since it is larger than the sum of its proper divisors (1531304).

1931428 is a wasteful number, since it uses less digits than its factorization.

1931428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11822 (or 11820 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 1931428 is about 1389.7582523590. The cubic root of 1931428 is about 124.5354060255.

The spelling of 1931428 in words is "one million, nine hundred thirty-one thousand, four hundred twenty-eight".