42123402 has 40 divisors (see below), whose sum is σ = 96598656. Its totient is φ = 13712328.

The previous prime is 42123401. The next prime is 42123449. The reversal of 42123402 is 20432124.

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 (42123401) 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, 3943 + ... + 9989.

Almost surely, 2^42123402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42123402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48299328).

42123402 is an abundant number, since it is smaller than the sum of its proper divisors (54475254).

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

42123402 is a wasteful number, since it uses less digits than its factorization.

42123402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104 (or 6095 counting only the distinct ones).

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

The square root of 42123402 is about 6490.2543863858. The cubic root of 42123402 is about 347.9427670444.

Adding to 42123402 its reverse (20432124), we get a palindrome (62555526).

The spelling of 42123402 in words is "forty-two million, one hundred twenty-three thousand, four hundred two".