45509402 has 4 divisors (see below), whose sum is σ = 68264106. Its totient is φ = 22754700.

The previous prime is 45509383. The next prime is 45509407. The reversal of 45509402 is 20490554.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45171841 + 337561 = 6721^2 + 581^2 .

It is a super-2 number, since 2×45509402² = 4142211340795208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45509407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377349 + ... + 11377352.

Almost surely, 2^45509402 is an apocalyptic number.

45509402 is a deficient number, since it is larger than the sum of its proper divisors (22754704).

45509402 is a wasteful number, since it uses less digits than its factorization.

45509402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22754703.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 45509402 is about 6746.0656682247. The cubic root of 45509402 is about 357.0264373761.

Adding to 45509402 its reverse (20490554), we get a palindrome (65999956).

The spelling of 45509402 in words is "forty-five million, five hundred nine thousand, four hundred two".