400445539 has 8 divisors (see below), whose sum is σ = 453946640. Its totient is φ = 350186976.

The previous prime is 400445509. The next prime is 400445597. The reversal of 400445539 is 935544004.

It is a happy number.

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 400445539 - 2⁹ = 400445027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400445509) 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, 810372 + ... + 810865.

It is an arithmetic number, because the mean of its divisors is an integer number (56743330).

Almost surely, 2^400445539 is an apocalyptic number.

400445539 is a deficient number, since it is larger than the sum of its proper divisors (53501101).

400445539 is a wasteful number, since it uses less digits than its factorization.

400445539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621269.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 400445539 is about 20011.1353750855. The cubic root of 400445539 is about 737.0797615066.

It can be divided in two parts, 4004 and 45539, that multiplied together give a triangular number (182338156 = T₁₉₀₉₆).

The spelling of 400445539 in words is "four hundred million, four hundred forty-five thousand, five hundred thirty-nine".