401223649 has 2 divisors, whose sum is σ = 401223650. Its totient is φ = 401223648.

The previous prime is 401223629. The next prime is 401223653. The reversal of 401223649 is 946322104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278723025 + 122500624 = 16695^2 + 11068^2 .

It is a cyclic number.

It is not a de Polignac number, because 401223649 - 2⁵ = 401223617 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401223649.

It is not a weakly prime, because it can be changed into another prime (401223619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200611824 + 200611825.

It is an arithmetic number, because the mean of its divisors is an integer number (200611825).

Almost surely, 2^401223649 is an apocalyptic number.

It is an amenable number.

401223649 is a deficient number, since it is larger than the sum of its proper divisors (1).

401223649 is an equidigital number, since it uses as much as digits as its factorization.

401223649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 401223649 is about 20030.5678651405. The cubic root of 401223649 is about 737.5568618037.

The spelling of 401223649 in words is "four hundred one million, two hundred twenty-three thousand, six hundred forty-nine".