40147920 has 80 divisors (see below), whose sum is σ = 138294720. Its totient is φ = 10705536.

The previous prime is 40147909. The next prime is 40147927. The reversal of 40147920 is 2974104.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×40147920² = 3223710960652800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40147927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7134 + ... + 11453.

It is an arithmetic number, because the mean of its divisors is an integer number (1728684).

Almost surely, 2^40147920 is an apocalyptic number.

40147920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40147920 is an abundant number, since it is smaller than the sum of its proper divisors (98146800).

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

40147920 is a wasteful number, since it uses less digits than its factorization.

40147920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18609 (or 18597 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40147920 is about 6336.2386318699. The cubic root of 40147920 is about 342.4162368199.

The spelling of 40147920 in words is "forty million, one hundred forty-seven thousand, nine hundred twenty".