400396549 has 4 divisors (see below), whose sum is σ = 457596064. Its totient is φ = 343197036.

The previous prime is 400396537. The next prime is 400396553. The reversal of 400396549 is 945693004.

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 not a de Polignac number, because 400396549 - 2¹³ = 400388357 is a prime.

It is a super-2 number, since 2×400396549² = 320634792902218802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400396559) 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, 28599747 + ... + 28599760.

It is an arithmetic number, because the mean of its divisors is an integer number (114399016).

Almost surely, 2^400396549 is an apocalyptic number.

It is an amenable number.

400396549 is a deficient number, since it is larger than the sum of its proper divisors (57199515).

400396549 is an equidigital number, since it uses as much as digits as its factorization.

400396549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57199514.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 400396549 is about 20009.9112691686. The cubic root of 400396549 is about 737.0497024793.

The spelling of 400396549 in words is "four hundred million, three hundred ninety-six thousand, five hundred forty-nine".