400400755949 has 8 divisors (see below), whose sum is σ = 401215239192. Its totient is φ = 399586904640.

The previous prime is 400400755871. The next prime is 400400755991. The reversal of 400400755949 is 949557004004.

It can be written as a sum of positive squares in 4 ways, for example, as 42506068900 + 357894687049 = 206170^2 + 598243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400400755949 - 2¹² = 400400751853 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 (400400755549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121027 + ... + 1434399.

It is an arithmetic number, because the mean of its divisors is an integer number (50151904899).

Almost surely, 2^400400755949 is an apocalyptic number.

It is an amenable number.

400400755949 is a deficient number, since it is larger than the sum of its proper divisors (814483243).

400400755949 is a wasteful number, since it uses less digits than its factorization.

400400755949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315967.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 400400755949 in words is "four hundred billion, four hundred million, seven hundred fifty-five thousand, nine hundred forty-nine".