402121145 has 8 divisors (see below), whose sum is σ = 510930504. Its totient is φ = 302773504.

The previous prime is 402121133. The next prime is 402121147. The reversal of 402121145 is 541121204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33327529 + 368793616 = 5773^2 + 19204^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402121145 - 2⁴ = 402121129 is a prime.

It is a super-2 number, since 2×402121145² = 323402830512222050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402121147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365334 + ... + 2365503.

It is an arithmetic number, because the mean of its divisors is an integer number (63866313).

Almost surely, 2^402121145 is an apocalyptic number.

It is an amenable number.

402121145 is a deficient number, since it is larger than the sum of its proper divisors (108809359).

402121145 is a wasteful number, since it uses less digits than its factorization.

402121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4730859.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 402121145 is about 20052.9585099057. The cubic root of 402121145 is about 738.1063985128.

Adding to 402121145 its reverse (541121204), we get a palindrome (943242349).

The spelling of 402121145 in words is "four hundred two million, one hundred twenty-one thousand, one hundred forty-five".