26403890 has 16 divisors (see below), whose sum is σ = 50323032. Its totient is φ = 9940224.

The previous prime is 26403889. The next prime is 26403899. The reversal of 26403890 is 9830462.

It can be written as a sum of positive squares in 4 ways, for example, as 26327161 + 76729 = 5131^2 + 277^2 .

It is not an unprimeable number, because it can be changed into a prime (26403899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77489 + ... + 77828.

Almost surely, 2^26403890 is an apocalyptic number.

26403890 is a deficient number, since it is larger than the sum of its proper divisors (23919142).

26403890 is a wasteful number, since it uses less digits than its factorization.

26403890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155341.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 26403890 is about 5138.4715626342. The cubic root of 26403890 is about 297.7757347553.

The spelling of 26403890 in words is "twenty-six million, four hundred three thousand, eight hundred ninety".