1620401843 has 4 divisors (see below), whose sum is σ = 1620557568. Its totient is φ = 1620246120.

The previous prime is 1620401821. The next prime is 1620401857. The reversal of 1620401843 is 3481040261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1620401843 - 2¹⁰ = 1620400819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620401863) 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, 61043 + ... + 83468.

It is an arithmetic number, because the mean of its divisors is an integer number (405139392).

Almost surely, 2^1620401843 is an apocalyptic number.

1620401843 is a deficient number, since it is larger than the sum of its proper divisors (155725).

1620401843 is a wasteful number, since it uses less digits than its factorization.

1620401843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155724.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1620401843 is about 40254.2152202723. The cubic root of 1620401843 is about 1174.5573930976.

The spelling of 1620401843 in words is "one billion, six hundred twenty million, four hundred one thousand, eight hundred forty-three".