400000538749 has 6 divisors (see below), whose sum is σ = 465306749214. Its totient is φ = 342857604600.

The previous prime is 400000538731. The next prime is 400000538759. The reversal of 400000538749 is 947835000004.

It can be written as a sum of positive squares in only one way, i.e., 289397733849 + 110602804900 = 537957^2 + 332570^2 .

It is not a de Polignac number, because 400000538749 - 2²⁵ = 399966984317 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 (400000538719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4081638102 + ... + 4081638199.

It is an arithmetic number, because the mean of its divisors is an integer number (77551124869).

Almost surely, 2^400000538749 is an apocalyptic number.

400000538749 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

400000538749 is a deficient number, since it is larger than the sum of its proper divisors (65306210465).

400000538749 is an equidigital number, since it uses as much as digits as its factorization.

400000538749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8163276315 (or 8163276308 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 400000538749 in words is "four hundred billion, five hundred thirty-eight thousand, seven hundred forty-nine".