40019969 has 8 divisors (see below), whose sum is σ = 44109408. Its totient is φ = 36005760.

The previous prime is 40019957. The next prime is 40019981. The reversal of 40019969 is 96991004.

It is an interprime number because it is at equal distance from previous prime (40019957) and next prime (40019981).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40019969 - 2⁴ = 40019953 is a prime.

It is a super-2 number, since 2×40019969² = 3203195837521922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40019939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17687 + ... + 19820.

It is an arithmetic number, because the mean of its divisors is an integer number (5513676).

Almost surely, 2^40019969 is an apocalyptic number.

It is an amenable number.

40019969 is a deficient number, since it is larger than the sum of its proper divisors (4089439).

40019969 is a wasteful number, since it uses less digits than its factorization.

40019969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37615.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 40019969 is about 6326.1338114207. The cubic root of 40019969 is about 342.0520907170.

Subtracting from 40019969 its sum of digits (38), we obtain a triangular number (40019931 = T₈₉₄₆).

The spelling of 40019969 in words is "forty million, nineteen thousand, nine hundred sixty-nine".