400421340 has 96 divisors (see below), whose sum is σ = 1359025920. Its totient is φ = 97070400.

The previous prime is 400421321. The next prime is 400421353. The reversal of 400421340 is 43124004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27766 + ... + 39645.

It is an arithmetic number, because the mean of its divisors is an integer number (14156520).

Almost surely, 2^400421340 is an apocalyptic number.

It is an amenable number.

400421340 is an abundant number, since it is smaller than the sum of its proper divisors (958604580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400421340 is a wasteful number, since it uses less digits than its factorization.

400421340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67440 (or 67432 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400421340 is about 20010.5307275944. The cubic root of 400421340 is about 737.0649139175.

Adding to 400421340 its reverse (43124004), we get a palindrome (443545344).

The spelling of 400421340 in words is "four hundred million, four hundred twenty-one thousand, three hundred forty".