400461521 has 4 divisors (see below), whose sum is σ = 400561572. Its totient is φ = 400361472.

The previous prime is 400461511. The next prime is 400461539. The reversal of 400461521 is 125164004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315453121 + 85008400 = 17761^2 + 9220^2 .

It is a cyclic number.

It is not a de Polignac number, because 400461521 - 2²² = 396267217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400461511) 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, 43760 + ... + 52113.

It is an arithmetic number, because the mean of its divisors is an integer number (100140393).

Almost surely, 2^400461521 is an apocalyptic number.

It is an amenable number.

400461521 is a deficient number, since it is larger than the sum of its proper divisors (100051).

400461521 is an equidigital number, since it uses as much as digits as its factorization.

400461521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100050.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 400461521 is about 20011.5346987681. The cubic root of 400461521 is about 737.0895671280.

The spelling of 400461521 in words is "four hundred million, four hundred sixty-one thousand, five hundred twenty-one".