402021145 has 8 divisors (see below), whose sum is σ = 482955840. Its totient is φ = 321263280.

The previous prime is 402021131. The next prime is 402021181. The reversal of 402021145 is 541120204.

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

It is not a de Polignac number, because 402021145 - 2¹³ = 402012953 is a prime.

It is a super-2 number, since 2×402021145² = 323242002054222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39151 + ... + 48340.

It is an arithmetic number, because the mean of its divisors is an integer number (60369480).

Almost surely, 2^402021145 is an apocalyptic number.

It is an amenable number.

402021145 is a deficient number, since it is larger than the sum of its proper divisors (80934695).

402021145 is an equidigital number, since it uses as much as digits as its factorization.

402021145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88415.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 402021145 is about 20050.4649572024. The cubic root of 402021145 is about 738.0452090263.

Adding to 402021145 its reverse (541120204), we get a palindrome (943141349).

The spelling of 402021145 in words is "four hundred two million, twenty-one thousand, one hundred forty-five".