400220669 has 4 divisors (see below), whose sum is σ = 402252444. Its totient is φ = 398188896.

The previous prime is 400220663. The next prime is 400220671. The reversal of 400220669 is 966022004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315488644 + 84732025 = 17762^2 + 9205^2 .

It is a cyclic number.

It is not a de Polignac number, because 400220669 - 2²⁰ = 399172093 is a prime.

It is a super-2 number, since 2×400220669² = 320353167789615122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400220663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015592 + ... + 1015985.

It is an arithmetic number, because the mean of its divisors is an integer number (100563111).

Almost surely, 2^400220669 is an apocalyptic number.

It is an amenable number.

400220669 is a deficient number, since it is larger than the sum of its proper divisors (2031775).

400220669 is a wasteful number, since it uses less digits than its factorization.

400220669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031774.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 400220669 is about 20005.5159643534. The cubic root of 400220669 is about 736.9417667445.

The spelling of 400220669 in words is "four hundred million, two hundred twenty thousand, six hundred sixty-nine".