42406636 has 24 divisors (see below), whose sum is σ = 81115776. Its totient is φ = 19311360.

The previous prime is 42406627. The next prime is 42406657. The reversal of 42406636 is 63660424.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 42406598 and 42406607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7951 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (3379824).

Almost surely, 2^42406636 is an apocalyptic number.

It is an amenable number.

42406636 is a deficient number, since it is larger than the sum of its proper divisors (38709140).

42406636 is a wasteful number, since it uses less digits than its factorization.

42406636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20169 (or 20167 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 42406636 is about 6512.0377763032. The cubic root of 42406636 is about 348.7208710571.

The spelling of 42406636 in words is "forty-two million, four hundred six thousand, six hundred thirty-six".