400038217 has 4 divisors (see below), whose sum is σ = 421092880. Its totient is φ = 378983556.

The previous prime is 400038187. The next prime is 400038251. The reversal of 400038217 is 712830004.

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 400038217 - 2¹⁵ = 400005449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400038191 and 400038200.

It is not an unprimeable number, because it can be changed into a prime (400038257) 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, 10527303 + ... + 10527340.

It is an arithmetic number, because the mean of its divisors is an integer number (105273220).

Almost surely, 2^400038217 is an apocalyptic number.

It is an amenable number.

400038217 is a deficient number, since it is larger than the sum of its proper divisors (21054663).

400038217 is a wasteful number, since it uses less digits than its factorization.

400038217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21054662.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 400038217 is about 20000.9554021802. The cubic root of 400038217 is about 736.8297644194.

The spelling of 400038217 in words is "four hundred million, thirty-eight thousand, two hundred seventeen".