40151989 has 4 divisors (see below), whose sum is σ = 40165056. Its totient is φ = 40138924.

The previous prime is 40151929. The next prime is 40152001. The reversal of 40151989 is 98915104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40151989 - 2⁷ = 40151861 is a prime.

It is a super-2 number, since 2×40151989² = 3224364441312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40151929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882 + ... + 9004.

It is an arithmetic number, because the mean of its divisors is an integer number (10041264).

Almost surely, 2^40151989 is an apocalyptic number.

It is an amenable number.

40151989 is a deficient number, since it is larger than the sum of its proper divisors (13067).

40151989 is an equidigital number, since it uses as much as digits as its factorization.

40151989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13066.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 40151989 is about 6336.5597132829. The cubic root of 40151989 is about 342.4278044146.

The spelling of 40151989 in words is "forty million, one hundred fifty-one thousand, nine hundred eighty-nine".