400485649 has 4 divisors (see below), whose sum is σ = 408042036. Its totient is φ = 392929264.

The previous prime is 400485619. The next prime is 400485713. The reversal of 400485649 is 946584004.

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 323748049 + 76737600 = 17993^2 + 8760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400485649 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400485619) 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, 3778114 + ... + 3778219.

It is an arithmetic number, because the mean of its divisors is an integer number (102010509).

Almost surely, 2^400485649 is an apocalyptic number.

It is an amenable number.

400485649 is a deficient number, since it is larger than the sum of its proper divisors (7556387).

400485649 is an equidigital number, since it uses as much as digits as its factorization.

400485649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7556386.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 400485649 is about 20012.1375420019. The cubic root of 400485649 is about 737.1043701648.

The spelling of 400485649 in words is "four hundred million, four hundred eighty-five thousand, six hundred forty-nine".