400215253 has 4 divisors (see below), whose sum is σ = 401737248. Its totient is φ = 398693260.

The previous prime is 400215251. The next prime is 400215271. The reversal of 400215253 is 352512004.

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 400215253 - 2¹ = 400215251 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 (400215251) 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, 760603 + ... + 761128.

It is an arithmetic number, because the mean of its divisors is an integer number (100434312).

Almost surely, 2^400215253 is an apocalyptic number.

It is an amenable number.

400215253 is a deficient number, since it is larger than the sum of its proper divisors (1521995).

400215253 is a wasteful number, since it uses less digits than its factorization.

400215253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521994.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 400215253 is about 20005.3806012283. The cubic root of 400215253 is about 736.9384424995.

Adding to 400215253 its reverse (352512004), we get a palindrome (752727257).

The spelling of 400215253 in words is "four hundred million, two hundred fifteen thousand, two hundred fifty-three".