400387249 has 4 divisors (see below), whose sum is σ = 411208564. Its totient is φ = 389565936.

The previous prime is 400387231. The next prime is 400387271. The reversal of 400387249 is 942783004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196897024 + 203490225 = 14032^2 + 14265^2 .

It is a cyclic number.

It is not a de Polignac number, because 400387249 - 2¹⁵ = 400354481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 10821277 = 400387249 / (4 + 0 + 0 + 3 + 8 + 7 + 2 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400387279) 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, 5410602 + ... + 5410675.

It is an arithmetic number, because the mean of its divisors is an integer number (102802141).

Almost surely, 2^400387249 is an apocalyptic number.

It is an amenable number.

400387249 is a deficient number, since it is larger than the sum of its proper divisors (10821315).

400387249 is a wasteful number, since it uses less digits than its factorization.

400387249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10821314.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 400387249 is about 20009.6788829806. The cubic root of 400387249 is about 737.0439959572.

The spelling of 400387249 in words is "four hundred million, three hundred eighty-seven thousand, two hundred forty-nine".