354978109 has 4 divisors (see below), whose sum is σ = 355015840. Its totient is φ = 354940380.

The previous prime is 354978103. The next prime is 354978119. The reversal of 354978109 is 901879453.

354978109 = T₁₅₃₈₂ + T₁₅₃₈₃ + T₁₅₃₈₄.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 354978109 - 2⁵ = 354978077 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 (354978103) 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, 8002 + ... + 27820.

It is an arithmetic number, because the mean of its divisors is an integer number (88753960).

Almost surely, 2^354978109 is an apocalyptic number.

354978109 is the 15384-th centered triangular number.

It is an amenable number.

354978109 is a deficient number, since it is larger than the sum of its proper divisors (37731).

354978109 is a wasteful number, since it uses less digits than its factorization.

354978109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37730.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 354978109 is about 18840.8627456388. The cubic root of 354978109 is about 708.0553204829.

The spelling of 354978109 in words is "three hundred fifty-four million, nine hundred seventy-eight thousand, one hundred nine".