402622440 has 64 divisors (see below), whose sum is σ = 1317677760. Its totient is φ = 97605120.

The previous prime is 402622439. The next prime is 402622453. The reversal of 402622440 is 44226204.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 402622440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151189 + ... + 153828.

It is an arithmetic number, because the mean of its divisors is an integer number (20588715).

Almost surely, 2^402622440 is an apocalyptic number.

402622440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402622440 is an abundant number, since it is smaller than the sum of its proper divisors (915055320).

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

402622440 is a wasteful number, since it uses less digits than its factorization.

402622440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305042 (or 305038 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 402622440 is about 20065.4538946917. The cubic root of 402622440 is about 738.4129855564.

Adding to 402622440 its reverse (44226204), we get a palindrome (446848644).

The spelling of 402622440 in words is "four hundred two million, six hundred twenty-two thousand, four hundred forty".