1620414401 has 4 divisors (see below), whose sum is σ = 1624645632. Its totient is φ = 1616183172.

The previous prime is 1620414359. The next prime is 1620414413. The reversal of 1620414401 is 1044140261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620414401 - 2⁶ = 1620414337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620410401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2115041 + ... + 2115806.

It is an arithmetic number, because the mean of its divisors is an integer number (406161408).

Almost surely, 2^1620414401 is an apocalyptic number.

It is an amenable number.

1620414401 is a deficient number, since it is larger than the sum of its proper divisors (4231231).

1620414401 is an equidigital number, since it uses as much as digits as its factorization.

1620414401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231230.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1620414401 is about 40254.3712036345. The cubic root of 1620414401 is about 1174.5604273354.

Adding to 1620414401 its reverse (1044140261), we get a palindrome (2664554662).

The spelling of 1620414401 in words is "one billion, six hundred twenty million, four hundred fourteen thousand, four hundred one".