400049251 has 4 divisors (see below), whose sum is σ = 457199152. Its totient is φ = 342899352.

The previous prime is 400049249. The next prime is 400049261. The reversal of 400049251 is 152940004.

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 400049251 - 2¹ = 400049249 is a prime.

It is a super-2 number, since 2×400049251² = 320078806451322002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400049261) 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, 28574940 + ... + 28574953.

It is an arithmetic number, because the mean of its divisors is an integer number (114299788).

Almost surely, 2^400049251 is an apocalyptic number.

400049251 is a deficient number, since it is larger than the sum of its proper divisors (57149901).

400049251 is an equidigital number, since it uses as much as digits as its factorization.

400049251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57149900.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 400049251 is about 20001.2312371014. The cubic root of 400049251 is about 736.8365388596.

Adding to 400049251 its reverse (152940004), we get a palindrome (552989255).

The spelling of 400049251 in words is "four hundred million, forty-nine thousand, two hundred fifty-one".