1939642 has 4 divisors (see below), whose sum is σ = 2909466. Its totient is φ = 969820.

The previous prime is 1939633. The next prime is 1939657. The reversal of 1939642 is 2469391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2469391 = 199 ⋅12409.

It can be written as a sum of positive squares in only one way, i.e., 1934881 + 4761 = 1391^2 + 69^2 .

It is a super-2 number, since 2×1939642² = 7524422176328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1939598 and 1939607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484909 + ... + 484912.

2^1939642 is an apocalyptic number.

1939642 is a deficient number, since it is larger than the sum of its proper divisors (969824).

1939642 is an equidigital number, since it uses as much as digits as its factorization.

1939642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969823.

The product of its digits is 11664, while the sum is 34.

The square root of 1939642 is about 1392.7103072786. The cubic root of 1939642 is about 124.7116982346.

The spelling of 1939642 in words is "one million, nine hundred thirty-nine thousand, six hundred forty-two".