400369538 has 4 divisors (see below), whose sum is σ = 600554310. Its totient is φ = 200184768.

The previous prime is 400369531. The next prime is 400369559. The reversal of 400369538 is 835963004.

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

It can be written as a sum of positive squares in only one way, i.e., 308458969 + 91910569 = 17563^2 + 9587^2 .

It is not an unprimeable number, because it can be changed into a prime (400369531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100092383 + ... + 100092386.

Almost surely, 2^400369538 is an apocalyptic number.

400369538 is a deficient number, since it is larger than the sum of its proper divisors (200184772).

400369538 is a wasteful number, since it uses less digits than its factorization.

400369538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200184771.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 400369538 is about 20009.2363172611. The cubic root of 400369538 is about 737.0331281630.

The spelling of 400369538 in words is "four hundred million, three hundred sixty-nine thousand, five hundred thirty-eight".