204139478 has 16 divisors (see below), whose sum is σ = 310443840. Its totient is φ = 100664256.

The previous prime is 204139459. The next prime is 204139487. The reversal of 204139478 is 874931402.

It is a super-2 number, since 2×204139478² = 83345852956224968, which contains 22 as substring.

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, 81176 + ... + 83652.

It is an arithmetic number, because the mean of its divisors is an integer number (19402740).

Almost surely, 2^204139478 is an apocalyptic number.

204139478 is a deficient number, since it is larger than the sum of its proper divisors (106304362).

204139478 is a wasteful number, since it uses less digits than its factorization.

204139478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 204139478 is about 14287.7387294141. The cubic root of 204139478 is about 588.8106635832.

The spelling of 204139478 in words is "two hundred four million, one hundred thirty-nine thousand, four hundred seventy-eight".