400451603 has 2 divisors, whose sum is σ = 400451604. Its totient is φ = 400451602.

The previous prime is 400451587. The next prime is 400451621. The reversal of 400451603 is 306154004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400451603 - 2⁴ = 400451587 is a prime.

It is a super-2 number, since 2×400451603² = 320722972690539218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400451663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200225801 + 200225802.

It is an arithmetic number, because the mean of its divisors is an integer number (200225802).

Almost surely, 2^400451603 is an apocalyptic number.

400451603 is a deficient number, since it is larger than the sum of its proper divisors (1).

400451603 is an equidigital number, since it uses as much as digits as its factorization.

400451603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 400451603 is about 20011.2868901528. The cubic root of 400451603 is about 737.0834820534.

The spelling of 400451603 in words is "four hundred million, four hundred fifty-one thousand, six hundred three".