400649501 has 4 divisors (see below), whose sum is σ = 457885152. Its totient is φ = 343413852.

The previous prime is 400649467. The next prime is 400649507. The reversal of 400649501 is 105946004.

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 400649501 - 2⁶ = 400649437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400649507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28617815 + ... + 28617828.

It is an arithmetic number, because the mean of its divisors is an integer number (114471288).

Almost surely, 2^400649501 is an apocalyptic number.

It is an amenable number.

400649501 is a deficient number, since it is larger than the sum of its proper divisors (57235651).

400649501 is an equidigital number, since it uses as much as digits as its factorization.

400649501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57235650.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 400649501 is about 20016.2309389155. The cubic root of 400649501 is about 737.2048810971.

The spelling of 400649501 in words is "four hundred million, six hundred forty-nine thousand, five hundred one".