420025251 has 8 divisors (see below), whose sum is σ = 562688704. Its totient is φ = 278689320.

The previous prime is 420025237. The next prime is 420025253. The reversal of 420025251 is 152520024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420025251 - 2²¹ = 417928099 is a prime.

It is a super-2 number, since 2×420025251² = 352842422955226002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420025253) 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, 331141 + ... + 332406.

It is an arithmetic number, because the mean of its divisors is an integer number (70336088).

Almost surely, 2^420025251 is an apocalyptic number.

420025251 is a deficient number, since it is larger than the sum of its proper divisors (142663453).

420025251 is a wasteful number, since it uses less digits than its factorization.

420025251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663761.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 420025251 is about 20494.5175839784. The cubic root of 420025251 is about 748.9022464780.

Adding to 420025251 its reverse (152520024), we get a palindrome (572545275).

The spelling of 420025251 in words is "four hundred twenty million, twenty-five thousand, two hundred fifty-one".