402240623 has 4 divisors (see below), whose sum is σ = 405408000. Its totient is φ = 399073248.

The previous prime is 402240613. The next prime is 402240637. The reversal of 402240623 is 326042204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402240623 - 2⁴ = 402240607 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 (402240613) 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, 1583498 + ... + 1583751.

It is an arithmetic number, because the mean of its divisors is an integer number (101352000).

Almost surely, 2^402240623 is an apocalyptic number.

402240623 is a deficient number, since it is larger than the sum of its proper divisors (3167377).

402240623 is a wasteful number, since it uses less digits than its factorization.

402240623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167376.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 402240623 is about 20055.9373503210. The cubic root of 402240623 is about 738.1794931882.

Adding to 402240623 its reverse (326042204), we get a palindrome (728282827).

The spelling of 402240623 in words is "four hundred two million, two hundred forty thousand, six hundred twenty-three".