400263081 has 4 divisors (see below), whose sum is σ = 533684112. Its totient is φ = 266842052.

The previous prime is 400263053. The next prime is 400263091. The reversal of 400263081 is 180362004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400263081 - 2²³ = 391874473 is a prime.

It is a super-2 number, since 2×400263081² = 320421068023225122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400263091) 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, 66710511 + ... + 66710516.

It is an arithmetic number, because the mean of its divisors is an integer number (133421028).

Almost surely, 2^400263081 is an apocalyptic number.

It is an amenable number.

400263081 is a deficient number, since it is larger than the sum of its proper divisors (133421031).

400263081 is a wasteful number, since it uses less digits than its factorization.

400263081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133421030.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 400263081 is about 20006.5759439240. The cubic root of 400263081 is about 736.9677974425.

The spelling of 400263081 in words is "four hundred million, two hundred sixty-three thousand, eighty-one".