400537745 has 4 divisors (see below), whose sum is σ = 480645300. Its totient is φ = 320430192.

The previous prime is 400537723. The next prime is 400537747. The reversal of 400537745 is 547735004.

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 245360896 + 155176849 = 15664^2 + 12457^2 .

It is a cyclic number.

It is not a de Polignac number, because 400537745 - 2¹⁶ = 400472209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400537747) 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, 40053770 + ... + 40053779.

It is an arithmetic number, because the mean of its divisors is an integer number (120161325).

Almost surely, 2^400537745 is an apocalyptic number.

It is an amenable number.

400537745 is a deficient number, since it is larger than the sum of its proper divisors (80107555).

400537745 is an equidigital number, since it uses as much as digits as its factorization.

400537745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80107554.

The product of its (nonzero) digits is 58800, while the sum is 35.

The square root of 400537745 is about 20013.4391097582. The cubic root of 400537745 is about 737.1363301318.

The spelling of 400537745 in words is "four hundred million, five hundred thirty-seven thousand, seven hundred forty-five".