1618972442 has 4 divisors (see below), whose sum is σ = 2428458666. Its totient is φ = 809486220.

The previous prime is 1618972363. The next prime is 1618972451. The reversal of 1618972442 is 2442798161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2442798161 = 103 ⋅23716487.

It can be written as a sum of positive squares in only one way, i.e., 1612102801 + 6869641 = 40151^2 + 2621^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1618972393 and 1618972402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404743109 + ... + 404743112.

Almost surely, 2^1618972442 is an apocalyptic number.

1618972442 is a deficient number, since it is larger than the sum of its proper divisors (809486224).

1618972442 is an equidigital number, since it uses as much as digits as its factorization.

1618972442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809486223.

The product of its digits is 193536, while the sum is 44.

The square root of 1618972442 is about 40236.4566282867. The cubic root of 1618972442 is about 1174.2119217086.

The spelling of 1618972442 in words is "one billion, six hundred eighteen million, nine hundred seventy-two thousand, four hundred forty-two".