402221442 has 32 divisors (see below), whose sum is σ = 920678400. Its totient is φ = 114756048.

The previous prime is 402221429. The next prime is 402221473. The reversal of 402221442 is 244122204.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 24559 + ... + 37517.

It is an arithmetic number, because the mean of its divisors is an integer number (28771200).

Almost surely, 2^402221442 is an apocalyptic number.

402221442 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

402221442 is an abundant number, since it is smaller than the sum of its proper divisors (518456958).

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

402221442 is a wasteful number, since it uses less digits than its factorization.

402221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13710.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 402221442 is about 20055.4591570475. The cubic root of 402221442 is about 738.1677595433.

Adding to 402221442 its reverse (244122204), we get a palindrome (646343646).

The spelling of 402221442 in words is "four hundred two million, two hundred twenty-one thousand, four hundred forty-two".