400040399989 has 4 divisors (see below), whose sum is σ = 403779095424. Its totient is φ = 396301704556.

The previous prime is 400040399981. The next prime is 400040400047. The reversal of 400040399989 is 989993040004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400040399989 - 2³ = 400040399981 is a prime.

It is a super-2 number, since 2×400040399989² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040399981) 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, 1869347557 + ... + 1869347770.

It is an arithmetic number, because the mean of its divisors is an integer number (100944773856).

Almost surely, 2^400040399989 is an apocalyptic number.

It is an amenable number.

400040399989 is a deficient number, since it is larger than the sum of its proper divisors (3738695435).

400040399989 is a wasteful number, since it uses less digits than its factorization.

400040399989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738695434.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 400040399989 in words is "four hundred billion, forty million, three hundred ninety-nine thousand, nine hundred eighty-nine".