403421240 has 32 divisors (see below), whose sum is σ = 909954000. Its totient is φ = 160967424.

The previous prime is 403421209. The next prime is 403421267. The reversal of 403421240 is 42124304.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4031 + ... + 28689.

Almost surely, 2^403421240 is an apocalyptic number.

403421240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

403421240 is an abundant number, since it is smaller than the sum of its proper divisors (506532760).

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

403421240 is a wasteful number, since it uses less digits than its factorization.

403421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25079 (or 25075 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 403421240 is about 20085.3488891779. The cubic root of 403421240 is about 738.9009982961.

Adding to 403421240 its reverse (42124304), we get a palindrome (445545544).

The spelling of 403421240 in words is "four hundred three million, four hundred twenty-one thousand, two hundred forty".