402123042 has 40 divisors (see below), whose sum is σ = 902593692. Its totient is φ = 133812000.

The previous prime is 402123037. The next prime is 402123047. The reversal of 402123042 is 240321204.

It is an interprime number because it is at equal distance from previous prime (402123037) and next prime (402123047).

It can be written as a sum of positive squares in 2 ways, for example, as 391683681 + 10439361 = 19791^2 + 3231^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (402123047) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 111792 + ... + 115332.

Almost surely, 2^402123042 is an apocalyptic number.

402123042 is an abundant number, since it is smaller than the sum of its proper divisors (500470650).

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

402123042 is a wasteful number, since it uses less digits than its factorization.

402123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256 (or 4247 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 402123042 is about 20053.0058096037. The cubic root of 402123042 is about 738.1075591794.

Adding to 402123042 its reverse (240321204), we get a palindrome (642444246).

The spelling of 402123042 in words is "four hundred two million, one hundred twenty-three thousand, forty-two".