203808005401 has 135 divisors (see below), whose sum is σ = 289448932365. Its totient is φ = 143019676800.

The previous prime is 203808005399. The next prime is 203808005419. The reversal of 203808005401 is 104500808302.

The square root of 203808005401 is 451451.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 135751718025 + 68056287376 = 368445^2 + 260876^2 .

It is not a de Polignac number, because 203808005401 - 2¹ = 203808005399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203808005441) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 4970926941 + ... + 4970926981.

Almost surely, 2^203808005401 is an apocalyptic number.

203808005401 is the 451451-st square number.

203808005401 is the 225726-th centered octagonal number.

It is an amenable number.

203808005401 is a deficient number, since it is larger than the sum of its proper divisors (85640926964).

203808005401 is an frugal number, since it uses more digits than its factorization.

203808005401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The spelling of 203808005401 in words is "two hundred three billion, eight hundred eight million, five thousand, four hundred one".