400181623 has 12 divisors (see below), whose sum is σ = 420001288. Its totient is φ = 381260880.

The previous prime is 400181611. The next prime is 400181657. The reversal of 400181623 is 326181004.

It is a de Polignac number, because none of the positive numbers 2^k-400181623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400181423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145168 + ... + 147898.

Almost surely, 2^400181623 is an apocalyptic number.

400181623 is a deficient number, since it is larger than the sum of its proper divisors (19819665).

400181623 is a wasteful number, since it uses less digits than its factorization.

400181623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3054 (or 3031 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 400181623 is about 20004.5400596964. The cubic root of 400181623 is about 736.9178003294.

The spelling of 400181623 in words is "four hundred million, one hundred eighty-one thousand, six hundred twenty-three".