400421029 has 4 divisors (see below), whose sum is σ = 421495840. Its totient is φ = 379346220.

The previous prime is 400421003. The next prime is 400421069. The reversal of 400421029 is 920124004.

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 400421029 - 2¹¹ = 400418981 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 (400421069) 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, 10537377 + ... + 10537414.

It is an arithmetic number, because the mean of its divisors is an integer number (105373960).

Almost surely, 2^400421029 is an apocalyptic number.

It is an amenable number.

400421029 is a deficient number, since it is larger than the sum of its proper divisors (21074811).

400421029 is a wasteful number, since it uses less digits than its factorization.

400421029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21074810.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 400421029 is about 20010.5229566846. The cubic root of 400421029 is about 737.0647230958.

The spelling of 400421029 in words is "four hundred million, four hundred twenty-one thousand, twenty-nine".