402241391 has 2 divisors, whose sum is σ = 402241392. Its totient is φ = 402241390.

The previous prime is 402241363. The next prime is 402241421. The reversal of 402241391 is 193142204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402241391 - 2¹⁰ = 402240367 is a prime.

It is a super-2 number, since 2×402241391² = 323596273267229762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402241391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402241331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201120695 + 201120696.

It is an arithmetic number, because the mean of its divisors is an integer number (201120696).

Almost surely, 2^402241391 is an apocalyptic number.

402241391 is a deficient number, since it is larger than the sum of its proper divisors (1).

402241391 is an equidigital number, since it uses as much as digits as its factorization.

402241391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 402241391 is about 20055.9564967618. The cubic root of 402241391 is about 738.1799629912.

Adding to 402241391 its reverse (193142204), we get a palindrome (595383595).

The spelling of 402241391 in words is "four hundred two million, two hundred forty-one thousand, three hundred ninety-one".