400920011 has 4 divisors (see below), whose sum is σ = 409450272. Its totient is φ = 392389752.

The previous prime is 400920001. The next prime is 400920043. The reversal of 400920011 is 110029004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400920011 - 2²⁶ = 333811147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400920001) 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, 4265060 + ... + 4265153.

It is an arithmetic number, because the mean of its divisors is an integer number (102362568).

Almost surely, 2^400920011 is an apocalyptic number.

400920011 is a deficient number, since it is larger than the sum of its proper divisors (8530261).

400920011 is an equidigital number, since it uses as much as digits as its factorization.

400920011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8530260.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 400920011 is about 20022.9870648712. The cubic root of 400920011 is about 737.3707587758.

Adding to 400920011 its reverse (110029004), we get a palindrome (510949015).

The spelling of 400920011 in words is "four hundred million, nine hundred twenty thousand, eleven".