349402578 has 16 divisors (see below), whose sum is σ = 798634560. Its totient is φ = 99829296.

The previous prime is 349402481. The next prime is 349402579. The reversal of 349402578 is 875204943.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 8319109 = 349402578 / (3 + 4 + 9 + 4 + 0 + 2 + 5 + 7 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (349402579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4159513 + ... + 4159596.

It is an arithmetic number, because the mean of its divisors is an integer number (49914660).

Almost surely, 2^349402578 is an apocalyptic number.

349402578 is an abundant number, since it is smaller than the sum of its proper divisors (449231982).

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

349402578 is a wasteful number, since it uses less digits than its factorization.

349402578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8319121.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 349402578 is about 18692.3133399802. The cubic root of 349402578 is about 704.3286723422.

The spelling of 349402578 in words is "three hundred forty-nine million, four hundred two thousand, five hundred seventy-eight".