1642790494 has 4 divisors (see below), whose sum is σ = 2464185744. Its totient is φ = 821395246.

The previous prime is 1642790489. The next prime is 1642790509. The reversal of 1642790494 is 4940972461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4940972461 = 149 ⋅33160889.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410697622 + ... + 410697625.

It is an arithmetic number, because the mean of its divisors is an integer number (616046436).

Almost surely, 2^1642790494 is an apocalyptic number.

1642790494 is a deficient number, since it is larger than the sum of its proper divisors (821395250).

1642790494 is an equidigital number, since it uses as much as digits as its factorization.

1642790494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821395249.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1642790494 is about 40531.3519883065. The cubic root of 1642790494 is about 1179.9421818841.

The spelling of 1642790494 in words is "one billion, six hundred forty-two million, seven hundred ninety thousand, four hundred ninety-four".