402040261 has 16 divisors (see below), whose sum is σ = 472715136. Its totient is φ = 334708416.

The previous prime is 402040241. The next prime is 402040283. The reversal of 402040261 is 162040204.

It is not a de Polignac number, because 402040261 - 2⁵ = 402040229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402040201) 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, 213255 + ... + 215131.

It is an arithmetic number, because the mean of its divisors is an integer number (29544696).

Almost surely, 2^402040261 is an apocalyptic number.

It is an amenable number.

402040261 is a deficient number, since it is larger than the sum of its proper divisors (70674875).

402040261 is a wasteful number, since it uses less digits than its factorization.

402040261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 402040261 is about 20050.9416487107. The cubic root of 402040261 is about 738.0569067930.

Adding to 402040261 its reverse (162040204), we get a palindrome (564080465).

The spelling of 402040261 in words is "four hundred two million, forty thousand, two hundred sixty-one".