402120005 has 16 divisors (see below), whose sum is σ = 564931584. Its totient is φ = 269013120.

The previous prime is 402120001. The next prime is 402120013. The reversal of 402120005 is 500021204.

It is not a de Polignac number, because 402120005 - 2² = 402120001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402120001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138677 + ... + 141546.

It is an arithmetic number, because the mean of its divisors is an integer number (35308224).

Almost surely, 2^402120005 is an apocalyptic number.

It is an amenable number.

402120005 is a deficient number, since it is larger than the sum of its proper divisors (162811579).

402120005 is a wasteful number, since it uses less digits than its factorization.

402120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280276.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 402120005 is about 20052.9300851521. The cubic root of 402120005 is about 738.1057010099.

Adding to 402120005 its reverse (500021204), we get a palindrome (902141209).

The spelling of 402120005 in words is "four hundred two million, one hundred twenty thousand, five".