400123653 has 4 divisors (see below), whose sum is σ = 533498208. Its totient is φ = 266749100.

The previous prime is 400123651. The next prime is 400123667. The reversal of 400123653 is 356321004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400123653 - 2¹ = 400123651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123651) 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, 66687273 + ... + 66687278.

It is an arithmetic number, because the mean of its divisors is an integer number (133374552).

Almost surely, 2^400123653 is an apocalyptic number.

It is an amenable number.

400123653 is a deficient number, since it is larger than the sum of its proper divisors (133374555).

400123653 is a wasteful number, since it uses less digits than its factorization.

400123653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133374554.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 400123653 is about 20003.0910861297. The cubic root of 400123653 is about 736.8822154971.

Adding to 400123653 its reverse (356321004), we get a palindrome (756444657).

The spelling of 400123653 in words is "four hundred million, one hundred twenty-three thousand, six hundred fifty-three".