402117440 has 28 divisors (see below), whose sum is σ = 957542916. Its totient is φ = 160846848.

The previous prime is 402117431. The next prime is 402117481. The reversal of 402117440 is 44711204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86415616 + 315701824 = 9296^2 + 17768^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627989 + ... + 628628.

Almost surely, 2^402117440 is an apocalyptic number.

402117440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402117440 is an abundant number, since it is smaller than the sum of its proper divisors (555425476).

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

402117440 is a wasteful number, since it uses less digits than its factorization.

402117440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256634 (or 1256624 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 402117440 is about 20052.8661293093. The cubic root of 402117440 is about 738.1041316233.

Adding to 402117440 its reverse (44711204), we get a palindrome (446828644).

The spelling of 402117440 in words is "four hundred two million, one hundred seventeen thousand, four hundred forty".