400021435 has 16 divisors (see below), whose sum is σ = 524224512. Its totient is φ = 290613600.

The previous prime is 400021411. The next prime is 400021463. The reversal of 400021435 is 534120004.

It is not a de Polignac number, because 400021435 - 2¹¹ = 400019387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56440 + ... + 63130.

It is an arithmetic number, because the mean of its divisors is an integer number (32764032).

Almost surely, 2^400021435 is an apocalyptic number.

400021435 is a deficient number, since it is larger than the sum of its proper divisors (124203077).

400021435 is a wasteful number, since it uses less digits than its factorization.

400021435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7794.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400021435 is about 20000.5358678211. The cubic root of 400021435 is about 736.8194606955.

Adding to 400021435 its reverse (534120004), we get a palindrome (934141439).

The spelling of 400021435 in words is "four hundred million, twenty-one thousand, four hundred thirty-five".