1620010394 has 4 divisors (see below), whose sum is σ = 2430015594. Its totient is φ = 810005196.

The previous prime is 1620010373. The next prime is 1620010411. The reversal of 1620010394 is 4930100261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4930100261 = 37 ⋅133245953.

It can be written as a sum of positive squares in only one way, i.e., 1239955369 + 380055025 = 35213^2 + 19495^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405002597 + ... + 405002600.

Almost surely, 2^1620010394 is an apocalyptic number.

1620010394 is a deficient number, since it is larger than the sum of its proper divisors (810005200).

1620010394 is an equidigital number, since it uses as much as digits as its factorization.

1620010394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810005199.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1620010394 is about 40249.3527152922. The cubic root of 1620010394 is about 1174.4628041437.

The spelling of 1620010394 in words is "one billion, six hundred twenty million, ten thousand, three hundred ninety-four".