139203542 has 4 divisors (see below), whose sum is σ = 208805316. Its totient is φ = 69601770.

The previous prime is 139203503. The next prime is 139203551. The reversal of 139203542 is 245302931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245302931 = 83 ⋅2955457.

It is a super-2 number, since 2×139203542² = 38755252210691528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34800884 + ... + 34800887.

It is an arithmetic number, because the mean of its divisors is an integer number (52201329).

Almost surely, 2^139203542 is an apocalyptic number.

139203542 is a deficient number, since it is larger than the sum of its proper divisors (69601774).

139203542 is an equidigital number, since it uses as much as digits as its factorization.

139203542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69601773.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 139203542 is about 11798.4550683553. The cubic root of 139203542 is about 518.2628695158.

The spelling of 139203542 in words is "one hundred thirty-nine million, two hundred three thousand, five hundred forty-two".