203980155 has 16 divisors (see below), whose sum is σ = 336897024. Its totient is φ = 105279840.

The previous prime is 203980151. The next prime is 203980159. The reversal of 203980155 is 551089302.

It is an interprime number because it is at equal distance from previous prime (203980151) and next prime (203980159).

It is not a de Polignac number, because 203980155 - 2² = 203980151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (203980151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218869 + ... + 219798.

It is an arithmetic number, because the mean of its divisors is an integer number (21056064).

Almost surely, 2^203980155 is an apocalyptic number.

203980155 is a deficient number, since it is larger than the sum of its proper divisors (132916869).

203980155 is a wasteful number, since it uses less digits than its factorization.

203980155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438706.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 203980155 is about 14282.1621262328. The cubic root of 203980155 is about 588.6574423671.

The spelling of 203980155 in words is "two hundred three million, nine hundred eighty thousand, one hundred fifty-five".