400048931 has 4 divisors (see below), whose sum is σ = 409806264. Its totient is φ = 390291600.

The previous prime is 400048907. The next prime is 400048949. The reversal of 400048931 is 139840004.

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 400048931 - 2¹⁸ = 399786787 is a prime.

It is a super-2 number, since 2×400048931² = 320078294388485522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400048894 and 400048903.

It is not an unprimeable number, because it can be changed into a prime (400048951) 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, 4878605 + ... + 4878686.

It is an arithmetic number, because the mean of its divisors is an integer number (102451566).

Almost surely, 2^400048931 is an apocalyptic number.

400048931 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

400048931 is a deficient number, since it is larger than the sum of its proper divisors (9757333).

400048931 is an equidigital number, since it uses as much as digits as its factorization.

400048931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9757332.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 400048931 is about 20001.2232375922. The cubic root of 400048931 is about 736.8363423940.

Adding to 400048931 its reverse (139840004), we get a palindrome (539888935).

The spelling of 400048931 in words is "four hundred million, forty-eight thousand, nine hundred thirty-one".