40021372 has 24 divisors (see below), whose sum is σ = 76106240. Its totient is φ = 18344880.

The previous prime is 40021369. The next prime is 40021381. The reversal of 40021372 is 27312004.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

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, 6138 + ... + 10849.

Almost surely, 2^40021372 is an apocalyptic number.

It is an amenable number.

40021372 is a deficient number, since it is larger than the sum of its proper divisors (36084868).

40021372 is a wasteful number, since it uses less digits than its factorization.

40021372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17041 (or 17039 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 40021372 is about 6326.2446996619. The cubic root of 40021372 is about 342.0560878338.

Adding to 40021372 its reverse (27312004), we get a palindrome (67333376).

The spelling of 40021372 in words is "forty million, twenty-one thousand, three hundred seventy-two".