40020351 has 16 divisors (see below), whose sum is σ = 61073664. Its totient is φ = 22834944.

The previous prime is 40020317. The next prime is 40020371. The reversal of 40020351 is 15302004.

It is not a de Polignac number, because 40020351 - 2¹⁰ = 40019327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40020351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020371) 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, 22735 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (3817104).

Almost surely, 2^40020351 is an apocalyptic number.

40020351 is a deficient number, since it is larger than the sum of its proper divisors (21053313).

40020351 is a wasteful number, since it uses less digits than its factorization.

40020351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 40020351 is about 6326.1640035649. The cubic root of 40020351 is about 342.0531790360.

Adding to 40020351 its reverse (15302004), we get a palindrome (55322355).

The spelling of 40020351 in words is "forty million, twenty thousand, three hundred fifty-one".