1957642 has 4 divisors (see below), whose sum is σ = 2936466. Its totient is φ = 978820.

The previous prime is 1957639. The next prime is 1957651. The reversal of 1957642 is 2467591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1957201 + 441 = 1399^2 + 21^2 .

It is a d-powerful number, because it can be written as 1 + 9 + 5⁹ + 7³ + 6² + 4⁶ + 2⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 1957598 and 1957607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489409 + ... + 489412.

2^1957642 is an apocalyptic number.

1957642 is a deficient number, since it is larger than the sum of its proper divisors (978824).

1957642 is an equidigital number, since it uses as much as digits as its factorization.

1957642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978823.

The product of its digits is 15120, while the sum is 34.

The square root of 1957642 is about 1399.1576037030. The cubic root of 1957642 is about 125.0962884759.

The spelling of 1957642 in words is "one million, nine hundred fifty-seven thousand, six hundred forty-two".