400855749 has 16 divisors (see below), whose sum is σ = 642977280. Its totient is φ = 217004400.

The previous prime is 400855747. The next prime is 400855757. The reversal of 400855749 is 947558004.

It is not a de Polignac number, because 400855749 - 2¹ = 400855747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400855749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400855747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501927 + ... + 502724.

It is an arithmetic number, because the mean of its divisors is an integer number (40186080).

Almost surely, 2^400855749 is an apocalyptic number.

It is an amenable number.

400855749 is a deficient number, since it is larger than the sum of its proper divisors (242121531).

400855749 is a wasteful number, since it uses less digits than its factorization.

400855749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004680.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 400855749 is about 20021.3822949366. The cubic root of 400855749 is about 737.3313598513.

The spelling of 400855749 in words is "four hundred million, eight hundred fifty-five thousand, seven hundred forty-nine".