400021703 has 4 divisors (see below), whose sum is σ = 400299600. Its totient is φ = 399743808.

The previous prime is 400021693. The next prime is 400021717. The reversal of 400021703 is 307120004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400021703 - 2⁶ = 400021639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400021753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136778 + ... + 139671.

It is an arithmetic number, because the mean of its divisors is an integer number (100074900).

Almost surely, 2^400021703 is an apocalyptic number.

400021703 is a deficient number, since it is larger than the sum of its proper divisors (277897).

400021703 is a wasteful number, since it uses less digits than its factorization.

400021703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277896.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 400021703 is about 20000.5425676405. The cubic root of 400021703 is about 736.8196252430.

Adding to 400021703 its reverse (307120004), we get a palindrome (707141707).

The spelling of 400021703 in words is "four hundred million, twenty-one thousand, seven hundred three".