400061621 has 8 divisors (see below), whose sum is σ = 402633504. Its totient is φ = 397498000.

The previous prime is 400061617. The next prime is 400061633. The reversal of 400061621 is 126160004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400061621 - 2² = 400061617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400061593 and 400061602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400061021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115511 + ... + 118923.

It is an arithmetic number, because the mean of its divisors is an integer number (50329188).

Almost surely, 2^400061621 is an apocalyptic number.

It is an amenable number.

400061621 is a deficient number, since it is larger than the sum of its proper divisors (2571883).

400061621 is a wasteful number, since it uses less digits than its factorization.

400061621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 400061621 is about 20001.5404656741. The cubic root of 400061621 is about 736.8441334028.

The spelling of 400061621 in words is "four hundred million, sixty-one thousand, six hundred twenty-one".