351840401 has 4 divisors (see below), whose sum is σ = 383825904. Its totient is φ = 319854900.

The previous prime is 351840389. The next prime is 351840439. The reversal of 351840401 is 104048153.

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.

It is a cyclic number.

It is not a de Polignac number, because 351840401 - 2²⁶ = 284731537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (351840451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15992735 + ... + 15992756.

It is an arithmetic number, because the mean of its divisors is an integer number (95956476).

Almost surely, 2^351840401 is an apocalyptic number.

It is an amenable number.

351840401 is a deficient number, since it is larger than the sum of its proper divisors (31985503).

351840401 is a wasteful number, since it uses less digits than its factorization.

351840401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31985502.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 351840401 is about 18757.4092294218. The cubic root of 351840401 is about 705.9629387998.

Adding to 351840401 its reverse (104048153), we get a palindrome (455888554).

The spelling of 351840401 in words is "three hundred fifty-one million, eight hundred forty thousand, four hundred one".