402609408 has 36 divisors (see below), whose sum is σ = 1071530208. Its totient is φ = 134202880.

The previous prime is 402609377. The next prime is 402609409. The reversal of 402609408 is 804906204.

It is a super-3 number, since 3×402609408³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402609409) 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, 261348 + ... + 262883.

It is an arithmetic number, because the mean of its divisors is an integer number (29764728).

Almost surely, 2^402609408 is an apocalyptic number.

402609408 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

402609408 is an abundant number, since it is smaller than the sum of its proper divisors (668920800).

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

402609408 is an equidigital number, since it uses as much as digits as its factorization.

402609408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524250 (or 524236 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 402609408 is about 20065.1291548298. The cubic root of 402609408 is about 738.4050185375.

The spelling of 402609408 in words is "four hundred two million, six hundred nine thousand, four hundred eight".