40013442 has 48 divisors (see below), whose sum is σ = 99433152. Its totient is φ = 11391840.

The previous prime is 40013431. The next prime is 40013447. The reversal of 40013442 is 24431004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40013447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67873 + ... + 68459.

It is an arithmetic number, because the mean of its divisors is an integer number (2071524).

Almost surely, 2^40013442 is an apocalyptic number.

40013442 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

40013442 is an abundant number, since it is smaller than the sum of its proper divisors (59419710).

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

40013442 is a wasteful number, since it uses less digits than its factorization.

40013442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40013442 is about 6325.6179144808. The cubic root of 40013442 is about 342.0334942060.

Adding to 40013442 its reverse (24431004), we get a palindrome (64444446).

The spelling of 40013442 in words is "forty million, thirteen thousand, four hundred forty-two".