1971428 has 12 divisors (see below), whose sum is σ = 3486252. Its totient is φ = 975360.

The previous prime is 1971427. The next prime is 1971433. The reversal of 1971428 is 8241791.

It can be written as a sum of positive squares in 2 ways, for example, as 550564 + 1420864 = 742^2 + 1192^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1971394 and 1971403.

It is not an unprimeable number, because it can be changed into a prime (1971427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153 + ... + 2928.

It is an arithmetic number, because the mean of its divisors is an integer number (290521).

2^1971428 is an apocalyptic number.

It is an amenable number.

1971428 is a deficient number, since it is larger than the sum of its proper divisors (1514824).

1971428 is a wasteful number, since it uses less digits than its factorization.

1971428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5182 (or 5180 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 1971428 is about 1404.0754965457. The cubic root of 1971428 is about 125.3892506135.

The spelling of 1971428 in words is "one million, nine hundred seventy-one thousand, four hundred twenty-eight".