351781940 has 24 divisors (see below), whose sum is σ = 758709672. Its totient is φ = 136909440.

The previous prime is 351781939. The next prime is 351781957. The reversal of 351781940 is 49187153.

It can be written as a sum of positive squares in 4 ways, for example, as 21196816 + 330585124 = 4604^2 + 18182^2 .

It is a junction number, because it is equal to n+sod(n) for n = 351781894 and 351781903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236951 + ... + 238430.

It is an arithmetic number, because the mean of its divisors is an integer number (31612903).

Almost surely, 2^351781940 is an apocalyptic number.

It is an amenable number.

351781940 is an abundant number, since it is smaller than the sum of its proper divisors (406927732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

351781940 is a wasteful number, since it uses less digits than its factorization.

351781940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475427 (or 475425 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 351781940 is about 18755.8508204773. The cubic root of 351781940 is about 705.9238362358.

The spelling of 351781940 in words is "three hundred fifty-one million, seven hundred eighty-one thousand, nine hundred forty".