402469840 has 60 divisors (see below), whose sum is σ = 948518532. Its totient is φ = 158807040.

The previous prime is 402469829. The next prime is 402469841. The reversal of 402469840 is 48964204.

It can be written as a sum of positive squares in 2 ways, for example, as 57699216 + 344770624 = 7596^2 + 18568^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 402469840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402469841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1907335 + ... + 1907545.

Almost surely, 2^402469840 is an apocalyptic number.

402469840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402469840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474259266).

402469840 is an abundant number, since it is smaller than the sum of its proper divisors (546048692).

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

402469840 is a wasteful number, since it uses less digits than its factorization.

402469840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 402469840 is about 20061.6509789200. The cubic root of 402469840 is about 738.3196838678.

It can be divided in two parts, 40246 and 9840, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 402469840 in words is "four hundred two million, four hundred sixty-nine thousand, eight hundred forty".