400898421 has 24 divisors (see below), whose sum is σ = 721965504. Its totient is φ = 208258560.

The previous prime is 400898419. The next prime is 400898429. The reversal of 400898421 is 124898004.

It is not a de Polignac number, because 400898421 - 2¹ = 400898419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400898429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288556 + ... + 289941.

It is an arithmetic number, because the mean of its divisors is an integer number (30081896).

Almost surely, 2^400898421 is an apocalyptic number.

It is an amenable number.

400898421 is a deficient number, since it is larger than the sum of its proper divisors (321067083).

400898421 is a wasteful number, since it uses less digits than its factorization.

400898421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578521 (or 578518 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 400898421 is about 20022.4479272640. The cubic root of 400898421 is about 737.3575224526.

The spelling of 400898421 in words is "four hundred million, eight hundred ninety-eight thousand, four hundred twenty-one".