400139743 has 2 divisors, whose sum is σ = 400139744. Its totient is φ = 400139742.

The previous prime is 400139731. The next prime is 400139749. The reversal of 400139743 is 347931004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400139743 - 2⁹ = 400139231 is a prime.

It is a super-2 number, since 2×400139743² = 320223627856212098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400139749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200069871 + 200069872.

It is an arithmetic number, because the mean of its divisors is an integer number (200069872).

Almost surely, 2^400139743 is an apocalyptic number.

400139743 is a deficient number, since it is larger than the sum of its proper divisors (1).

400139743 is an equidigital number, since it uses as much as digits as its factorization.

400139743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 400139743 is about 20003.4932699266. The cubic root of 400139743 is about 736.8920926737.

The spelling of 400139743 in words is "four hundred million, one hundred thirty-nine thousand, seven hundred forty-three".