400546421 has 6 divisors (see below), whose sum is σ = 440270166. Its totient is φ = 364133000.

The previous prime is 400546409. The next prime is 400546427. The reversal of 400546421 is 124645004.

It can be written as a sum of positive squares in only one way, i.e., 254402500 + 146143921 = 15950^2 + 12089^2 .

It is not a de Polignac number, because 400546421 - 2¹⁴ = 400530037 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 (400546427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1655030 + ... + 1655271.

It is an arithmetic number, because the mean of its divisors is an integer number (73378361).

Almost surely, 2^400546421 is an apocalyptic number.

It is an amenable number.

400546421 is a deficient number, since it is larger than the sum of its proper divisors (39723745).

400546421 is a wasteful number, since it uses less digits than its factorization.

400546421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310323 (or 3310312 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 400546421 is about 20013.6558629352. The cubic root of 400546421 is about 737.1416524339.

The spelling of 400546421 in words is "four hundred million, five hundred forty-six thousand, four hundred twenty-one".