400271261 has 6 divisors (see below), whose sum is σ = 433430010. Its totient is φ = 369481008.

The previous prime is 400271243. The next prime is 400271269. The reversal of 400271261 is 162172004.

It can be written as a sum of positive squares in 3 ways, for example, as 49420900 + 350850361 = 7030^2 + 18731^2 .

It is not a de Polignac number, because 400271261 - 2¹⁰ = 400270237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400271269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1184066 + ... + 1184403.

It is an arithmetic number, because the mean of its divisors is an integer number (72238335).

Almost surely, 2^400271261 is an apocalyptic number.

It is an amenable number.

400271261 is a deficient number, since it is larger than the sum of its proper divisors (33158749).

400271261 is a wasteful number, since it uses less digits than its factorization.

400271261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368495 (or 2368482 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 400271261 is about 20006.7803756626. The cubic root of 400271261 is about 736.9728177703.

The spelling of 400271261 in words is "four hundred million, two hundred seventy-one thousand, two hundred sixty-one".