40201644 has 48 divisors (see below), whose sum is σ = 112851200. Its totient is φ = 10881216.

The previous prime is 40201639. The next prime is 40201661. The reversal of 40201644 is 44610204.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 40201644.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10999 + ... + 14190.

Almost surely, 2^40201644 is an apocalyptic number.

It is an amenable number.

40201644 is an abundant number, since it is smaller than the sum of its proper divisors (72649556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40201644 is a wasteful number, since it uses less digits than its factorization.

40201644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25222 (or 25220 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40201644 is about 6340.4766382347. The cubic root of 40201644 is about 342.5689036785.

Adding to 40201644 its reverse (44610204), we get a palindrome (84811848).

The spelling of 40201644 in words is "forty million, two hundred one thousand, six hundred forty-four".