1620400318 has 16 divisors (see below), whose sum is σ = 2510008704. Its totient is φ = 783751680.

The previous prime is 1620400273. The next prime is 1620400321. The reversal of 1620400318 is 8130040261.

It is a super-2 number, since 2×1620400318² = 5251394381149002248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1620400292 and 1620400301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255846 + ... + 262102.

It is an arithmetic number, because the mean of its divisors is an integer number (156875544).

Almost surely, 2^1620400318 is an apocalyptic number.

1620400318 is a deficient number, since it is larger than the sum of its proper divisors (889608386).

1620400318 is a wasteful number, since it uses less digits than its factorization.

1620400318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10467.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1620400318 is about 40254.1962781522. The cubic root of 1620400318 is about 1174.5570246292.

Adding to 1620400318 its reverse (8130040261), we get a palindrome (9750440579).

The spelling of 1620400318 in words is "one billion, six hundred twenty million, four hundred thousand, three hundred eighteen".