649408401 has 16 divisors (see below), whose sum is σ = 970605120. Its totient is φ = 429105600.

The previous prime is 649408399. The next prime is 649408439. The reversal of 649408401 is 104804946.

It is a happy number.

649408401 is a `hidden beast` number, since 649 + 4 + 0 + 8 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 649408401 - 2¹ = 649408399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649408451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103375 + ... + 109476.

It is an arithmetic number, because the mean of its divisors is an integer number (60662820).

Almost surely, 2^649408401 is an apocalyptic number.

It is an amenable number.

649408401 is a deficient number, since it is larger than the sum of its proper divisors (321196719).

649408401 is a wasteful number, since it uses less digits than its factorization.

649408401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212973 (or 212967 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 649408401 is about 25483.4927158739. The cubic root of 649408401 is about 865.9762223967.

The spelling of 649408401 in words is "six hundred forty-nine million, four hundred eight thousand, four hundred one".