40420756 has 6 divisors (see below), whose sum is σ = 70736330. Its totient is φ = 20210376.

The previous prime is 40420753. The next prime is 40420763. The reversal of 40420756 is 65702404.

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 6081156 = 5860^2 + 2466^2 .

It is a super-2 number, since 2×40420756² = 3267675031223072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052591 + ... + 5052598.

Almost surely, 2^40420756 is an apocalyptic number.

It is an amenable number.

40420756 is a deficient number, since it is larger than the sum of its proper divisors (30315574).

40420756 is a wasteful number, since it uses less digits than its factorization.

40420756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105193 (or 10105191 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 40420756 is about 6357.7319855433. The cubic root of 40420756 is about 343.1901469307.

The spelling of 40420756 in words is "forty million, four hundred twenty thousand, seven hundred fifty-six".